on February 6, 2023
Standard Colors for Landcover Maps
Geographic Information SystemsWhich colours do you use to show land? Different colours are used to represent land use on a map. Agricultural land use is represented with Yellow colour. While blue is used for commercial, red is for residential and green is used for forest lands. What is the colour code for land? The different colors used
on February 6, 2023
PostGIS ST_Intersection of polygons can return lines
Geographic Information SystemsWhat is the difference between ST_Overlaps and ST_Intersects? Use ST_Intersects to determine whether two geometries intersect. Use ST_Crosses to determine whether one geometry crosses another. Use ST_Overlaps to determine whether two geometries of the same dimension overlap. How does St_ intersection work? The ST_Intersection() function takes two ST_Geometry objects and returns the intersection set as
on February 6, 2023
Seeking shapefiles of global climate/climatic zones
Geographic Information SystemsWhat are the 3 global climate zones? According to the three cell convection model of each hemisphere the Earth neatly separates itself into three distinct climate zones; the polar, temperate, and the tropical zones. What are the 5 climate zones? one of five classifications of the Earth’s climates: tropical, dry, mild, continental, and polar.
on February 6, 2023
How to convert contours and raster surface from Petrel to shapefiles and rasters that can display in ArcGIS?
Geographic Information SystemsHow do I export a map from Petrel? Right click on the polygon in the Petrel navigation tree and select Export. How do I create a contour map in Arcgis? In order to create contours, you will need to enable the Spatial Analyst toolbar, which can be found by going to Customize > Toolbars >
on February 6, 2023
Rasters not displaying correctly when opening from a project in QGIS
Geographic Information SystemsHow do I open a raster file in QGIS? Add a raster layer into QGIS Download your chosen data layer. Use the ‘+ map’ button to add your chosen raster dataset to your collection, and click Export. Extract your download to a new folder. Open Quantum GIS (QGIS) Select Add Raster Layer. Zoom to your
on February 6, 2023
Arcmap – add an image to a legend that is not part of layer symbology
Geographic Information SystemsHow to hide a map item in the ArcMap map legend but maintain the symbol on the map? How To: Hide a map item in the ArcMap map legend but maintain the symbol on the map In the Layout view, insert the map legend by configuring the Legend Wizard dialog box. Right-click the map legend,
on February 6, 2023
Image Classification error
Geographic Information SystemsWhat are the problems in image classification? There are following main challenges in image classification: Intra-Class Variation. Scale Variation. View-Point Variation. Occlusion. Illumination. Background Clutter. How do you solve image classification problems? From a deep learning perspective, the image classification problem can be solved through transfer learning. Transfer learning. Convolutional neural networks. Repurposing a
on February 6, 2023
Append Annotation within a ArcGIS geodatabase
Geographic Information SystemsHow do I append in ArcGIS? Quote from video: And the schema is the same you can take the other table and you can append it. Over so that it puts all of the new data on the bottom. So i have both of my tables opened here in the attribute. Where is the Append
on February 6, 2023
Distance calculation PostGIS
Geographic Information SystemsHow do you find the distance between two points in PostGIS? ST_Distance in PostGIS To construct a basic query in SQL to find the distance between two points, use the ST_Distance function. ST_Distance is flexible in that you can pass in geometry or geography type object (see here for more information on these object types).
on February 6, 2023
How to load layers from postgis to dotspatial or sharemap viewer
Geographic Information SystemsHow do I add a layer to PostGIS in Qgis? Open QGIS, select Layer -> Add layer -> Add PostGIS layers, it should open the interface to connect a PostGIS table. 2. In the dialogue, click “New”, it should open the dialogue to configure the PostGIS server, and database (nyc1). Enter relevant information in Step