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Geographic Information Systems : Recent Questions and Answers (Page 53)

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

Identify Features Incorrect Selection

The identify features tool returns the wrong selection when I try to select multiple features. In the image, I am trying to select the orange region, but QGIS is identifying...

Asked on 09/26/2021 by James Harrison

1 answer

Grouping similar Node links in attribute table of QGIS

I have a situation like this: I have network with nodes (vertices) and points. I extracted the nodes using Extract Vertices in QGIS. After that I connected...

Asked on 09/26/2021

0 answer

PyQGIS Remove VertexMarker

I have several plugins I am using that involve rubberbands and their equivalent points (QgisVertexMarkers). My problem looks to come from removing them from the display. This process...

Asked on 09/26/2021 by DGreenewalt

1 answer

Cloud mask error: Pattern 'cfmask' did not match any bands

I want to "replace" the values of the cloud pixels for: it could be a mean, to calculate pre and pos-date NDVI for one country.I've used the code of...

Asked on 09/26/2021 by Vânia Borges

1 answer

Geoserver & PostGIS: Cannot create PoolableConnectionFactory

I am trying to add a PostGIS database a data store in my Geoserver installation but I keep getting this error: Error creating data store, check the parameters. Error message:...

Asked on 09/26/2021

4 answer

Points to Line Without Sorting

I want to create a centerline from points without sorting the points. Workflow so far:Created a series of points (2,418) as a multipoint feature where two line features intersected using...

Asked on 09/26/2021

1 answer

Test for spatial uniformity of areal variable

Suppose we have data for uniform polygons with weight variable n and value variable x representing an average of observations within each polygon that looks like this: ...

Asked on 09/26/2021 by dshkol

0 answer

How do I produce a time series of the NDVI with Landsat composites with Google Earth Engine?

I am trying to obtain a yearly time series of the NDVI values for a series of locations, specifically 82 random squared polygons. As I need the best temporal resolution...

Asked on 09/26/2021

0 answer

Selecting lines intersecting lines on two points in QGIS 3.14

I have two shapes of lines: one A with exploded red lines, the other B with closed black lines. In a virtual layer I want to select the yellow ones...

Asked on 09/26/2021

2 answer

How to solve the "Map data not yet available" tiles when exporting from QGIS Composer?

I have a basemap layer from ESRI (through Quick Map Services plugin > 'Search QMS') and everythings works fine for me while being on the project. The problem appears...

Asked on 09/26/2021

2 answer

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