Many NA values when extracting data from a RasterLayer onto SpatialPolygons
Geographic Information SystemsHow to extract raster values to polygon in R? These are the main steps in the process: Load raster and polygon data. Mask and crop the raster layer. Subset the multipolygon feature collection. Extract the underlying raster values for each feature in the polygon layer. How to extract pixel values from raster in R?
Projection transform in OpenLayers3
Geographic Information SystemsWhat is the default projection for Openlayers? If you do not explicitly set one, your map is going to use our default which is the Web Mercator projection (EPSG:3857). How do I change the projection of a layer in QGIS? To change the projection of the current map project, click within the map projection information
Spatial Join features of File GDB to shape – problems
Geographic Information SystemsHow to convert geodatabase file to shapefile? Converting a geodatabase to shapefiles Start ArcCatalog. On the main menu, click Customize > Toolbars > Production Mapping. Click the Production Geodatabase to Shapefile button. Click the ellipsis (…) Navigate to the geodatabase you want to convert to shapefiles. Click Select. Which is a limitation when storing geospatial
Measuring distance from observations to coastline
Geographic Information SystemsHow would you measure a coastline? The prevailing method of estimating the length of a border (or coastline) was to lay out n equal straight-line segments of length ℓ with dividers on a map or aerial photograph. Each end of the segment must be on the boundary. Why is it so hard to measure coastline?
Ogr2ogr the result of merging two shapefiles has attributes missing
Geographic Information SystemsHow do I combine two shapefiles with different attributes? Process Click on the Vector menu, Data Management tools, Merge Shapefiles to One Ensure the correct shapefile type is selected (points, lines, or polygons). Select the folder where the two (or more) shapefiles you want to merge are located using the Browse button. How do
Merge without dissolve in ArcGIS for Desktop?
Geographic Information SystemsWhat is the difference between merge and dissolve ArcGIS? Dissolve: A tool that combines multiple features within a layer into one based on a common attribute value. Online help. Merge features: Must be done in an editing session. Can combine selected features within a layer. What is the opposite of dissolve ArcGIS? Union The opposite
Downloading RGB Sentinel-2 with Google Earth Engine and Python
Geographic Information SystemsHow do I download Sentinel-2 images from Google Earth Engine? Quote from video: Right click it. And select download don't worry about any virus warnings just click download anyway save this file into your gis folder. Can you use Python in Google Earth Engine? In addition to the web-based IDE Google Earth Engine also provides
How to add a URL as a QGIS Favorite in browser
Geographic Information SystemsHow do I add a browser to QGIS? The browser panel is located at the bottom of the left-hand panel in QGIS. Click on the Browser tab to open the QGIS Browser. If you do not see the Browser tab, enable it by doing to View ‣ Panels ‣ Browser (Windows and Mac) or Settings
Getting lat&lon extent of country by its name using Python
Geographic Information SystemsHow do you get a long lat? Get the coordinates of a place On your computer, open Google Maps. Right-click the place or area on the map. This will open a pop-up window. You can find your latitude and longitude in decimal format at the top. To copy the coordinates automatically, left click on the
How to export Point-shape coordinates to csv (X,Y)?
Geographic Information SystemsHow do I export a point shapefile to CSV? You can convert shapefile in CSV using GIS software also. You just need to open the shapefile as vector layer and save it as CSV. For adding the vector layer tyou need to go to Layer->add vector layer and browse the shapefile. After the right click