Qgis Raster Statistics

Let's go in reverse this time and take a discrete raster and convert it to vector. The initial goal was to provide a GIS data viewer. QGIS enables users to create, manipulate, and visualize spatial data. GeoTiff files can get very large if not compressed. Add Raster Data: QGIS explicitly differentiates between vector and raster data format. Watch Queue Queue. A raster is technically char. This guide explains what the process of georeferencing involves and provides detailed instructions for georeferencing raster data using QGIS software. A wide array of image-based data is reviewed and explored. If you found this tutorial on your own, you probably won’t require much external motivation to give this. Can anyone help me with getting my system setup correctly for adding raster layers from a Postgresgl10/PostFIS3 server setup on an RHEL7 server. - Raster data is data that is image based. Vector and raster data are prime data formats. Digital Elevation Model (DEM) Formats DEMs are files that contain either points (vector) or pixels (raster), with each point or pixel having an elevation value. Learn more about thematic and continuous data. Add a raster layer into QGIS The Koordinates Query API for non-technical users Use Changesets via WFS Find and use OGC web services Download data for Google Maps Get data from Koordinates into Google Earth Introducing the Query API Vector query Set query Raster query Create a webmap using Koordinates tiles and Mapbox GL Use Koordinates tile. A few weeks ago, I updated my Freehand Raster Georeferencer plugin for the newly released QGIS 3. The main reason is that raster data is supported via another open source module called GDAL, which adds powerful operations for raster data processing. Thanks for the reply. Inglada2 1CENTRE FOR REMOTE IMAGING, SENSING AND PROCESSING, NATIONAL UNIVERSITY OF SINGAPORE 2CENTRE NATIONAL D’ÉTUDES SPATIALES, TOULOUSE, FRANCE 3APOGEE IMAGING NTERNATIONAL, AUSTRALIA "Orfeo Toolbox is not a black box". For a few days ago, the new version of QGIS 2. , ESRI ShapeFile, geotiff). Gordon Luckett shows how to get QGIS up and running on your computer and create maps with vector and raster data. The first thing you must make sure the image data type is byte and you accomplish that with Raster -> Conversion -> Translate. I've been using QGIS since the end of last year. Overview of the task ¶ Given a raster grid of maximum temperature in the US, we need to extract the temperature at all urban areas and also calculate the average temperature for each county in the US. All documentation is in English but some documents such as the user guide are also available in other languages. Raster images can contain one or more bands, each covering the same spatial area, but containing different information. After sifting through some tutorials and experimenting with GDAL, PostGIS, and QGIS, I successfully imported a GeoTIFF Landsat image into a PostGIS raster table and accessed values by geographic location from that table. This is an intermediate course in spatial data analysis, i. Reported by: "is not a supported raster data source" a quick test with Ubuntu 10. QGIS offers several options to derive this parameter, I will show you two of them (which I had used in the past). QGIS normally adds the version number after “QGIS”, which is currently 1. Today, we are going to learn how to add a raster layer to QGIS. Scanned map datasets don't normally contain spatial reference information (either embedded in the file or as a separate file). Layers (double click to add) [raster selection] List of all raster layers loaded in the legend. 3/5 stars with 22 reviews. Consider this post a small preview of what you can expect with v3. After downloading DEM file you need to unzip it. QGIS provides a continuously growing number of capabilities provided by core functions and plugins. Zoom to the area of interest in QGIS. I tried the algorithm 'raster l. It only works with the older XLS-format, not with the newer XLSX format. Each cell in the raster grid is the same size, and cells are usually rectangular (in QGIS they will always be rectangular). org Large resolution raster layers can slow navigation in QGIS. Gordon Luckett shows how to get QGIS up and running on your computer and create maps with vector and raster data. Raster layers are referred by their name and the number of the band: [email protected]_number. Spatial statistics were uniquely created to analyze vector data in order to find patterns and relationships within a distribution. GRASS GIS includes tools for spatial modeling, visualization of raster and vector data, management and analysis of geospatial data, and the processing of satellite and aerial imagery. There are various options for importing data, including importing all layers in a directory. When you open a GeoTiff as a raster layer, it may have no style, and be rendered as a "singleband" grayscale raster image. Overwhelmed?. Step 3 - Joining the data. Conducting Zonal Statistics in QGIS. All these plugins available from my repository and can be installed with the QGIS Plugin Manager. It allows you to create, edit, visualise, analyse and publish geospatial information on Windows, Mac OS, Linux, BSD and Android (via the QField app). At least in some versions of QGIS, they will need to be in the same projection. Assessment of flooded areas can be done using radar data, such as the Sentinel-1 SAR imagery provided by the European Space Agency (ESA). In this post you get pictorial tutorial for how to download Landsat 8 images in QGIS 3. ) Now click on perform conversion. Hello dear QGis users! A collegue and me were wondering if it is possible to create contour lines, or more important for us, FILLED contour. We will also look at how to access layer and zonal statistics. calculateStatistics(None) calculates by default just Count, Sum and Mean (as you can tell from Raster -> Zonal Statistics in QGIS Desktop, it can do a lot more). In this page we will use QGIS to convert a format not recognised by TUFLOW into a format used by TUFLOW. You also have many choices when styling raster data in QGIS Desktop. Obtaining the width and height of a raster. On the middle-left, as per Figure 3 is a window containing various programs data can be added from. QGIS LAB SERIES - Lab 7 - Raster Data Analysis - Working with Topographic Data 13. stats vector=vector_zones layer=1 raster=values column_prefix=val. Because time is valuable for all of us, Natural Earth gives a quick start map layout file as a ArcMap MXD and QGIS QGS file. This book contains instructions on how to perform basic operations within QGIS. Conducting Zonal Statistics in QGIS. To create a 3D map with this plugin, you need only terrain data. Finally I did the kriging and exported the data to a raster in R, and from that raster I extracted the data under canopy and out canopy in QGIS using the fishnet and the tools "interaction" (to. 2004-02-26 [ts] ** Added a tab to raster layer properties dialog to show metadata about the raster layer (using gdal metadata) 2004-02-26 [gs] 0. It is necessary to enter a number as a "z factor". In fact all this does is print a hillshade of the raster. (Advanced step) Export a new GeoTIFF Do things line up in QGIS? The code below creates a raster and seeds it with some data. 8 and qgis2threejs. QGIS LAB SERIES - Lab 7 – Raster Data Analysis - Working with Topographic Data 13. 3 Adding raster data to the map. QGIS interpolation supports Triagulated Irregular Network (TIN) and Inverse Distance Weighting (IDW) methods for interpolation. Basically this is same layer as zones layer with new columns containing statistics added. So I have data from bioclim (*. I work with QGIS GDAL,I have many raster image 'geotiff' with one band for many dates, I want to create a table that contains statistics for all rasters that I have. Creating an elevation hillshade. Vector describes geographic data into three types of geometry. R has some dedicated packages for working with raster data. So go to "Raster - Miscellaneous - Build Virtual Raster (Catalog)"pick the 3 raster layers, tick "Separate" and define…. Because nearest neighbor resampling doesn't alter any values in the output raster data set, it is ideal for categorical, nominal and ordinal data. How To: Convert NoData values to other values for raster data Summary. QGIS is a powerful GIS software that supports various raster formats such as JPEG, GeoTiff, GIF and many more. third map, some of the intermediate data used for the cost surface. Values and operators [calculator]. RASTER - VECTOR TOOLS are tools used for either the conversion or raster to vector (or vice versa) and tools used combining the use of raster grids and vector files. Raster Data On Polylines is a simple QGIS plugin for extracting and manipulating raster data on polylines. Thanks for the reply. I tried the algorithm 'raster l. If you found this tutorial on your own, you probably won’t require much external motivation to give this. QGIS can be used to perform a number of raster data analysis and management tasks. This is the option I have selected. In the next section, you will discover how to prepare vector and raster data for processing and discover advanced data creation and editing techniques. hello community, i am very new to QGIS, but i find it invaluable for converting many types of topographical data. Landsat 7 ETM+ DN data, we use the following expression: DN7 = slope O * DN5 intercept O where DN7 is the Landsat 7 ETM+ equivalent DN data, DN5 is the Landsat 5 TM DN data, and the slope and intercept are band-specific numbers given by the inverse of those found in Vogelmann et al. Because time is valuable for all of us, Natural Earth gives a quick start map layout file as a ArcMap MXD and QGIS QGS file. So I have data from bioclim (*. Rasters are grids of pixels that have a specific value assigned to them. VECTOR TOOLS is a mammoth collection of tools for analysis, creation, geometric overlay, statistics, table and selection algorithms for vector points, lines and polygons. Land cover statistics for classified raster shapes Since last week i spend my evenings in order to code a new plugin for the QGIS community. ) Now click on perform conversion. Raster Data The raster dataset used in this tutorial is the 1 Arc-second (~30m) Digital Elevation Model from the U. Raster data are stored as an image file with associated geographical information. bitmap, image file to display as a marker. This video shows you how to add raster data to QGIS. QGIS supports both raster and vector layers; vector data is stored as either point, line, or polygon features. Raster data are good for showing continually varying information. We will style these layers. ArcGIS Spatial Analyst: Advanced GIS Spatial Analysis Using Raster and Vector Data J-8747 December 2001 4 Visualize the data with advanced symbology and annotation options. With the QGIS GRASS plugin, you can easily open a GRASS raster layer in QGIS. Users are able to generate maps using a variety of map layers using different projections. Select Int16 as the Output data type. calculateStatistics(None) calculates by default just Count, Sum and Mean (as you can tell from Raster -> Zonal Statistics in QGIS Desktop, it can do a lot more). QGIS is Free software and you are under no obligation to pay anything to use it - in fact we want to encourage people far and wide to use it regardless of what your financial or social status is - we believe empowering people with spatial decision making tools will result in a better society for all of humanity. There is a detailed description of the Plugin Manager in the corresponding section of the QGIS User Guide. Loading a raster layer. Here we are using weighted overlay analysis to find out ground water potential zones in a river basin using open source QGIS software. There has never been a time in the history of GIS when so much free, high quality data has been available. Converting null(no data) to 0. GIS data can be separated into two categories: spatially referenced data which is represented by vector and raster forms (including imagery) and attribute tables which is represented in tabular format. Now, I have published the scripts and sample data in my QGIS-Processing-tools repository on Github. This talk covers some of the in's and out's of switching software, tools, and workflows. In Arcgis if you use "calculate statistics" in ArcCatalog, statistics are calculated for every image band. This plugin is installed by default in the normal installation of QGIS (I use QGIS 2. Creating vector contours from elevation data. I work with QGIS GDAL,I have many raster image 'geotiff' with one band for many dates, I want to create a table that contains statistics for all rasters that I have. Vector describes geographic data into three types of geometry. 1 Load Data Page 3 of 18 Click the Add Vector Layer button to add geospatial data (Figure 2), which opens a window (Figure 3). Raster data are especially suited to continuous data. Vectorization: Convert Raster to Vector. Download the sample data. It would allow to extract raster statistics with a vector layer : mean raster value for each vector features (polygon, line or point), and also standard deviation, median. Loading Close. ations on raster datasets on QGIS. Now categorize and edit your metadata without any hassle, and calculate landscape stats as well using the new plugins for Raster from QGIS. Basically this is same layer as zones layer with new columns containing statistics added. Conducting Zonal Statistics in QGIS. QGISHow to make raster to point Jhih Cyuan Shen National Taipei University of Technology 2. I have a dataset from Open StreetMap (*. I need a set of equidistant points (like a raster) each in a 1km distance to the next over a certain area, in my case Germany. runalg ( 'qgis:zonalstatistics' , input_raster , raster_band , input_vector , column_prefix , global_extent , output_layer ). 8 brings back the OTB Processing provider, which was removed in the QGIS 3. Landsat 8 provide satellite images for remote sensing. Open raster data 3. Turn off all the vector layers. Choose the data you want and click OK. I work with QGIS GDAL,I have many raster image 'geotiff' with one band for many dates, I want to create a table that contains statistics for all rasters that I have. In this section, we are going to focus on rendering raster data. Looking at Kenya’s GDP, the African country has the highest gross domestic product per capita in the East African Community and still only reaches a value that is less than 2 per cent of the GDP of my home country Germany. And QGIS and GRASS GIS at least both offer front-ends for the GDAL functions mentioned below. QGIS has a useful selection of sample data on their website. hosted on land. In the ArcMap table of contents, right-click the raster dataset you want to export, click Data , then click Export Data. Raster images tend to be used for grids as they are a more efficient method of showing large areas of coloured pixels than vector maps. This is probably one of the best sources for free global GIS data. QgsZonalStatistics(vectorlayer,rasterfile) zonalstats. Create, edit, manage and export data¶ You can create, edit, manage and export vector maps in several formats. Raster Data The raster dataset used in this tutorial is the 1 Arc-second (~30m) Digital Elevation Model from the U. 14 that provides you with clear, step-by-step exercises to help you apply your GIS knowledge to QGIS. While the structure of raster data is simple, it is exceptionally useful for a wide range of applications. We will style these layers. The last third of the book covers more technical aspects of QGIS, including working with the Processing Toolbox, how to automate workflows with batch processing, and how to create graphical models. Raster data are good for showing continually varying information. RGB compositions are very important in remote sensing studies, however, there doesn't seem to be a function in QGIS. QGIS offers the following: Digitizing tools for OGR supported formats and GRASS vector layer; Create and edit shapefiles and GRASS vector. Use the QGIS raster calculator to set no data values and change values based on another raster layer. Turn off all the vector layers. gdal (for example importing GeoTiffs) Supported vector formats via v. With the QGIS GRASS plugin, you can easily open a GRASS raster layer in QGIS. If you are aware of shapefiles and the corresponding file types in an explorer you may simple drag the shp-file to the layer table and that’s it. Within the spatial referenced data group, the GIS data can be further classified into two different types: vector and raster. The Landsat imagery. You can visualize, manage, edit, analyse data, and design maps. 0 master candidate (or QGIS 2. Learn the latest GIS technology through free live training seminars, self-paced courses, or classes taught by Esri experts. Open QGIS and load the raster. Erich Purpur - EcoValuator: QGIS plugin. "Clip Raster by Mask Layer" is the tool in QGIS. Select Raster tools• Select Translate(Convert format) 4. Loading Close. xxx e-38 Starting to wonder if it is not something stupid like the fact that the french decimal separator is a comma instead of a period or something like that. Watch Queue Queue. 5 (yet to be released at the time of writing). It is made up of pixels, like a photograph, and a raster image will always be some number of pixels wide and some number of pixels high. Simply drag and drop the map-file into the left part of your working-GUI of QGis. Loading data to PostGIS using SPIT. QGIS supports both raster and vector layers; vector data is stored as either point, line, or polygon features. QGIS Documentation. The data includes two raster datasets as well as multiple vector datasets. This characteristic is what makes GIS software such a powerful tool. QGIS aims to be an easy to use GIS, providing common functions and features. 3 release) by default but you might have to activate it in Plugin Manager:. Elevation data (DEM) is also distributed as raster files. qgis-server-tutorial-data Rename training_manual_data folder into exercise_data Sep 14, 2018 raster Rename training_manual_data folder into exercise_data Sep 14, 2018 school_property_photos Rename training_manual_data folder into exercise_data Sep 14, 2018. Assessment of flooded areas can be done using radar data, such as the Sentinel-1 SAR imagery provided by the European Space Agency (ESA). The first is a simple workflow using sample vector data that covers geoprocessing tools such as buffer, clip and merge. I have recently been working on a project that has required the extraction of information from a raster layer based on point positions in a vector layer. To maintain data integrity, we should keep the same data type for the merged layer. Conducting Zonal Statistics in QGIS. You also have many choices when styling raster data in QGIS Desktop. The data will look like this:. 0 has the GDAL version 1. Raster Menü Raster hesaplayıcı… Ara değer belirleme Coğrafi Referanslama Aracı Heatmap Terrain analysis Zonal statistics Projection Dönüşüm Extraction Analiz Miscellaneous Gdal araçları ayarları. Hi fellow qgis-users, I'm sure there is a way to do this but I can't figure it out, it's been bugging me for some time. To add raster data, the Add Raster Layer button should be clicked. Also the default output data format is GeoTiff. 04 64 bits system. tif’ into a GIS package such as QGIS or ArcGIS and repeat the exercise by creating – in the exact same way – a merged ‘dtm. There is a collection of plugins ready to be used, available to download. Raster layer statistics¶ Description¶ Calculates basic statistics of the raster layer. Zonal statistics plug-in in QGIS compute mean of the raster. QGIS has a lot of documentation. Open QGIS and open the DEM. txt) or view presentation slides online. The provider was updated to use all the new goodies which are available in Processing in QGIS 3, and is once again available out-of-the-box for all your imagery analysis requirements!. Spatial data is data associated to a location or a place, commonly defined in terms of vector (points, lines, or polygons) or raster (bitmap) data. The size of pixels in a raster determines its spatial resolution. It will also demonstrate how to perform a field calculation within a model. I have also converted this to a SHP file or Raster format). Layers (double click to add) [raster selection] List of all raster layers loaded in the legend. Reprojecting and transforming data; Case study: This ensures various techniques and methods of vector analysis are used to solve a real life problem; Network analysis and spatial statistics; Module: Rasters Analysis of how QGIS deals with raster data and operations that can be carried on raster data. The following QGIS Raster Calculator expression should be sufficient (raster layer named "myraster"), since the QGIS Raster Calculator sets all pixels that do not satisfy the condition to nodata:. Add a raster layer into QGIS The Koordinates Query API for non-technical users Use Changesets via WFS Find and use OGC web services Download data for Google Maps Get data from Koordinates into Google Earth Introducing the Query API Vector query Set query Raster query Create a webmap using Koordinates tiles and Mapbox GL Use Koordinates tile. Calculates statistics on values of a raster within the zones of another dataset. Open population data in QGIS Open QGIS Desktop Load raster data to QGIS • from main menu choose Layer -Add Layer -Add Raster Layer or choose the icon in the left panel of QGIS window. Watch Queue Queue. Conducting Zonal Statistics in QGIS. I recently tried to use the QGIS 2. All raster data is essentially a raster dataset, whereas the mosaic dataset and raster catalog are storage mechanisms that allow you to store and manage collections of raster data. The initial goal was to provide a GIS data viewer. For processing speed, it's generally the fastest because of its simplicity. This video describes how to open raster data in QGIS. Hi, I am trying to use the Zonal statistics tool in QGIS to extract the sum of several raster layers. One of GDAL’s tools is ogr2ogr , which we’ll use to load a GeoJSON file into PostGIS. Gordon Luckett shows how to get QGIS up and running on your computer and create maps with vector and raster data. Careful, the size of the zipped file is approximately 21 Mbs. QGIS supports vector, raster, and database formats and lets you browse and create map data on your computer. Some of his other data visualisations can be seen on his @marinemaps Twitter account or the Marine Scotland Maps portal maps. pdf), Text File (. Raster data is used in a. Vector describes geographic data into three types of geometry. What happens to the resulting raster's resolution when you change the range of lat and long values to 5 instead of 10? Try 20, 50 and 100?. Digitising rasters using QGIS. Raster data are a grid of regularly sized pixels. Calculates statistics on values of a raster within the zones of another dataset. currently i am processing some ALOS data. Adding raster data to QGIS is done using the same data manager as vector data, except you must use the raster tab. Combining IP Address Manager (IPAM) with User Device Tracker (UDT) can help find and fix IP conflicts, improve visibility, and enhance reliability. 8 Excel files can be opened directly in QGIS. The newest ones also allow the user to analyze the landscape as well as patch metrics of layers from the data. Hello, welcome to my QGIS for Beginner tutorial. Global Mapper rates 4. Save your project. we will build on on basic spatial data analysis tasks (such as those covered in the beginner version course: Core Spatial Data Analysis: Introductory GIS with R and QGIS) and teach users how to practically implement more complex GIS tasks such as interpolation, mapping spatial data. By doing mathematical operations on these values, one can do some interesting analysis. Next, you will need to download the DEM GeoTiff from your Map Detail page. QGIS supports a large number of GIS data formats through the GDAL/OGR library and other plugins. ogr (for example importing Shapefiles). Density analysis can be used to show areas where there is a high occurrence of data. A guide to GoogleMaps-like maps with OSM in QGIS. tif ) Format. Raster data are a grid of regularly sized pixels. I try to run it in Erdas but after a few processes it aborts. Through clear, practical exercises, this book will introduce you to working with QGIS quickly and painlessly. e Apply DOS1 Atmospheric Correction and Create Virtual Raster as shown below. It works great on smaller rasters, but you may want to go out for a cup of coffee if used for larger raster layers. bitmap, image file to display as a marker. With the QGIS GRASS plugin, you can easily open a GRASS raster layer in QGIS. Understand the basics of R and QGIS to work with GIS and remote sensing data; Learn to manage, manipulate, and analyze spatial data using R and QGIS; Apply machine learning algorithms to geospatial data using R and QGIS; Page Count : 354 : Course Length : 10 hours 37 minutes : ISBN : 9781788991674 : Date Of Publication : 30 Nov 2018. The available raster layers will be listed in the dialog. I run QGIS on a UBUNTU 12. See for example the landuse layer in the North Carolina data set, opened in QGIS in the screenshot below. QGIS 64 bit (Geographic Information System) is advanced geospatial database software that allows users not only to create their own geospatial information with a wide variety of tools for visualization, editing, analytics, and publishing but also in-depth features for taking advantage of such geospatial data. Conducting Zonal Statistics in QGIS. This plugin is installed by default in the normal installation of QGIS (I use QGIS 2. After downloading DEM file you need to unzip it. Data themes are available in three levels of detail. Download the sample data. DEM's are often used to then update the elevation values of overlying points, for example I have used data from DEM's to update the elevation values of address points and utilities. Here's what the raster buildings look like in the table of contents: QGIS comes loaded with algorithms and plugins for you. Raster data is used in a. All documentation is in English but some documents such as the user guide are also available in other languages. This functionality is available in QGIS via two plugins - Point Sampling Tool and Zonal Statistics plugin. 1 Introduction. 8 and qgis2threejs. Understand the basics of R and QGIS to work with GIS and remote sensing data; Learn to manage, manipulate, and analyze spatial data using R and QGIS; Apply machine learning algorithms to geospatial data using R and QGIS; Page Count : 354 : Course Length : 10 hours 37 minutes : ISBN : 9781788991674 : Date Of Publication : 30 Nov 2018. Use the same map window as the IDW interpolation, just turn off the ‘IDW_500m_clipped’ raster layer so that just the data points are visible again. How To: Convert NoData values to other values for raster data Summary. This is already getting long, so I won't describe every option—just how to convert the satellite scene. hosted on land. • select il_cook_pop2010myc. Reprojecting a raster. ogr (for example importing Shapefiles). These plugins can also be installed directly from the QGIS Plugin Manager within the QGIS application. For each scale, themes are listed on Cultural, Physical, and Raster category pages. Open raster data 3. bitmap, image file to display as a marker. The first thing you must make sure the image data type is byte and you accomplish that with Raster -> Conversion -> Translate. I have a dataset from Open StreetMap (*. I am using QGIS. Raster data can also be created from vector data, which can be done by gridding a series of coordinates/points. It will also show you how to add vector data and modify layer attributes. The size of pixels in a raster determines its spatial resolution. Apparently the connection to the database can be made, as the raster images are listed once you press 'Connect', but when try to display them, either I see a black box or anything at all. Raster images are stored in image files with varying formats. Swapping raster bands. ArcGIS Generalization toolset has the nibble and expand tools to fill in NoData holes. QGIS plugins web portal. But before we are discussing about drawing contour lines in QGIS, let's start talking a little bit about the concept of contour line, what contour line definition is, contour lines characteristics and and how the method in drawing contour line. I have recently been working on a project that has required the extraction of information from a raster layer based on point positions in a vector layer. Values and operators [calculator]. Therefore we will discuss how to add a raster layer from both data sources. These include photos. Consider this post a small preview of what you can expect with v3. Select Int16 as the Output data type. This is probably one of the best sources for free global GIS data. Create, edit, manage and export data¶ You can create, edit, manage and export vector maps in several formats. Typing 'ef' ("edit features") followed by the name of the corresponding operation allows you to perform the edits directly via the keyboard. Within a GIS, the uses of raster data fall under four main categories: Rasters as basemaps. QGIS runs on Linux, Unix, Mac OS and Windows and supports numerous vector, raster, and database formats and functionalities. Digitising rasters using QGIS. Data raster adalah data yang disimpan dalam bentuk kotak segi empat (grid)/sel sehingga terbentuk suatu ruang yang teratur. We can use raster, RStoolbox, and more to analyze raster data in R. DEM's are often used to then update the elevation values of overlying points, for example I have used data from DEM's to update the elevation values of address points and utilities. Adding raster data to QGIS is done using the same data manager as vector data, except you must use the raster tab. We can add various types of raster data to QGIS including digital elevation models and orthophotos. Adding raster layer to QGIS is very easy. GeoTiff files can get very large if not compressed. Digital Elevation Model (DEM) Formats DEMs are files that contain either points (vector) or pixels (raster), with each point or pixel having an elevation value. The file size of the uncompressed GeoTiff version is about 2GB. As mentioned in the dataset layer details, the input data type is 16-bit signed integer. Because time is valuable for all of us, Natural Earth gives a quick start map layout file as a ArcMap MXD and QGIS QGS file. Transforming Raster Data¶. Describe the bug Exporting a raster as "Raw data" to GeoPackage fails silently. If you found this tutorial on your own, you probably won’t require much external motivation to give this. Gordon Luckett shows how to get QGIS up and running on your computer and create maps with vector and raster data. Counting raster bands. Raster styles in QGIS govern how the raw data is displayed on an 8-bit-per-pixel screen. QGIS is a free and open-source geographic information system that can be used to process data that can support the land use classification process. This is already getting long, so I won't describe every option—just how to convert the satellite scene. Vectors models are points, lines and polygons. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: