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QGIS 2.12 has support for saving a layer on the map in the GeoPackage format and that is great. However, I don't see a way to add another layer to the GPKG file, even though GeoPackage supports multiple layers. Is this functionality that is yet to come in QGIS or is there a way to do it with...

Can kriging be an exact* method? For example, when optimized with the Geostatistical Wizard? Or in any other way? (as far as I know, "normal" kriging isn't an exact method). *exact: predictions at known observed values yield exactly the same values again. أكثر...

I'm in a discussion with a colleague who believes that kriging should not be used to interpolate a surface from polygon based data (i.e. with kriging applied to centroids), because this effectively translates the spatial uncertainty inherent in any polygon centroid into data error in the kriged...

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In the postgis documentation it's mentioned that ST_collect returns a MULTI* or a GEOMETRYCOLLECTION. But how can i force the function to only return a geometrycollection not depending on it's input argument. For Example: I have a postegreSQL database with a column of type GeometryCollection...

I am loading a project with: QgsProject.instance().read(QFileInfo(path))When i try to load another project it subtracts the layers and shows nothing. But if I try doing it again it works. أكثر...

In view of recent proliferation of online/desktop routing tools (such as qgis road graph plugin, osm routing machine, google maps engine, routexl, OpenRouteService etc), it is imperatives to provide empirical evaluation of comparative strength and weakness of a number of predominant routing...

How can I insert an ArcMap shapefile in AutoCad or how can I save the shapefile so as to put it in Autocad Workspace? Even a tool in ArcMap that exports shapefile in a form which can be inserted in AutoCad or AutoCad Map would do. أكثر...

I have a point shapefile with attributes (diameter, latitude and longitude). For each point in that file, I want to create a polygon (circle) described by those attributes. The new shapefile should have circles of described diameter. I am using ArcGIS 10.0. أكثر...

I wrote a python script in order to get all features near a point and its distances. To reach that, I'm using LocateFeaturesAlongRoutes_lr, then performing a join with a feature layer and finally using a field mappings object to rename and remove attributes. This last step is done using...

this is a follow on question from here I am trying to get cs2cs to work but I am getting the following error. My command is as follows: cs2cs +init=epsg:4326 +to +init=epsg:3857 -f "%%.2f" merc.txt And the output when using PROJ_DEBUG=5 is pj_open_lib(epsg): call...

Using GeoServer I can make a WMS getFeatureInfo request using the application/vnd.ogc.gml info_format and it returns the full GML of the feature, including the geometry. This is really useful as I can then use this GML in the browser to highlight features. Example geoserver request...

!!!-Exclusively for GIS AREA-!!! PacktPub - ArcGIS Blueprints Book Description Publication Date: December 2015 About This Book Get to grips with the big world of Python add-ins and wxPython in GUI development to implement their features in your application Integrate advanced Python...

Below is my code AbstractGridCoverage2DReader reader = null;try { reader = new GeoTiffReader(new File(path1)); Coverage cov1 = reader.read(null ); double[] v1 = new double[]{2/3D}; Coverage cm1 = Operations.DEFAULT.multiply(cov1,v1); GeoTiffWriter writer = new...

There are two basic ways to run a GIS project. These are the ‘shapefile approach’ and the ‘geodatabase approach’. This video briefly considers the merits of these two approaches for biologists. أكثر...

I hope its a simple question. If I have a geoalgorithm in my model and I want the value from one the parameters, then how can I get it? For example I want the layer name in the parameter 'layer' in below figure so I get the value 'Pts1'. أكثر...

I want to have mutiple overview files (one for each overview level) for a GeoTiff, so I'm able to edit this files in a raster editor. How can this be done? Unfortunately, gdaladdo -ro creates only one .ovr file for a tiff, that contains all the overviews. Maybe this can be done by using VRT...

The following is being attempted in the console for a postgis enabled rails4.2 application. @target = Target.last@meter_radius = 2500@valid_points = Target.where("ST_DWithin(#{@target.lat}, #{@target.lon}, #{@meter_radius}))lat and lon are defined as decimal values. This translates into the...

Yesterday we had a look at the work of Japanese GPS artist Yassan. We contacted him to ask about getting his routes in KML format. He was unable to release the ‘Peace on Earth’ route featured yesterday as it still needs to be verified by Guinness World Records, but has kindly shared some of his...