Distance calculation PostGIS

How 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). 

How to load layers from postgis to dotspatial or sharemap viewer

How 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

Validating range domains when editing feature service in ArcGIS Online?

How do I change my domain in Arcgis online? Click the field’s display name to open settings for the field. Click Edit next to List of Values (Domain). Can an attribute take any value outside its domain? Answer. Values beyond a range domain are allowed in an attribute table because there is a validation process

Finding image overlap in Landsat images – Google Earth Engine

How do I download Landsat data from Google Earth Engine? Quote from video: So you go to uh data sets uh on the googlers engine platform. And uh if you click here landsat collections you have landsat 8 here. What is a mosaic in Google Earth Engine? Mosaicking refers to the process of spatially assembling

Coordinate Reference System issues between SHP and Raster file in QGIS?

How does QGIS deal with layers that are in different coordinate systems? You will see that the default is Automatically enable ‘on the fly’ reprojection if the layers have different CRS. This means that when QGIS detects that you have loaded layers with different CRS, it will automatically re-project them back to a common CRS

Fixing document path during PDF export from ArcMap?

How do I export a georeferenced PDF from ArcMap? Creating a georeferenced pdf is very simple. Once the map is finished, just select “File – Export Map…” as shown below. Go to the “Advanced” tab and check on “Export Map Georeference Information”. That’s it! How do I know if a PDF map is georeferenced? In

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