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Geographic Information Systems : Recent Questions and Answers (Page 527)

Find answers to your questions about Geographic Information Systems or help others by answering their Geographic Information Systems questions.

Selecting polygon feature classes with one record in Oracle geodatabase using SQL query?

I have an Oracle Enterprise geodatabase with many feature classes. I would like a SQL query to find all the polygon feature classes with only one record in its table....

Asked on 11/06/2020 by Mich

1 answer

Spatially joining spark data frame with shapefile using PySpark

I am pretty new to geo data. I have a spark data frame and would like to spatially join it with a shapefile using PySpark. I know how to read...

Asked on 11/06/2020 by Tracy Yang

0 answer

Openlayers 4.6.5 Drawing not populating on map

The code is as follows@Input( 'coreMap' ) coreMap :CoreMapComponent vectorLayer : VectorLayer; modifyLayer : Modify; draw: Draw; vectorSource: VectorSource; style: Style; snap: Snap;...

Asked on 11/06/2020 by Munerz

1 answer

Error in running Iso-Area polygon algorithm of QNEAT3 plugin

I am going to generate isochrones using Iso-Area algorithm of QNEAT3 plugin. I have a CSV file including start point coordinates. I read this file as a layer in QGIS....

Asked on 11/05/2020 by Elham

0 answer

CRS errors whed reading MODIS NetCDF file

I am working with MODIS EVI 250m file in NetCDF format and trying to get the stack of EVI layers.So, I do:# check nc-file for variables namesnc =...

Asked on 11/05/2020 by DI S

1 answer

MapInfo tab files with LargeInt can't be converted to QGIS or any other format

I am trying to convert a MapInfo tab file with ogr2ogr I did this:ogr2ogr -f "ESRI Shapefile" testing.shp TEST.tabAnd get this error;ERROR 3: Failed to parse field definition...

Asked on 11/05/2020

2 answer

How to overlap two layers of points with different size

I am new in QGIS. Here is my problem : I have two layers of points. In these two layers, my points have different degrees or size : For...

Asked on 11/05/2020 by nicolax9777

1 answer

Calculating date field with just a year double field [QGIS]

I have a dataset in QGIS that I originally created in ArcMap. It has two fields for dates, let's call them 'date_from' and 'date_to'. Both of these fields contain only...

Asked on 11/04/2020 by Matt Houston

1 answer

Resampling locationtech.jts LineString

I have a polyline represented by LineString class. I need to add additional points in between its points at a distance, say d. So if P1 and P2 are first...

Asked on 11/04/2020

0 answer

PyQGIS: QgsVectorFileWriter.create() doesn't flush even after deleted

If QgsVectorFileWriter constructor is directly used, the output is flushed when the reference is deleted. I'm trying to switch to QgsVectorFileWriter.create() because QGIS warns that the former is being...

Asked on 11/04/2020 by user159687

2 answer

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