Geographic Information Systems Questions, Problems & Solutions : TransWikia.com ~ Page 478

Display map tip in QGIS does not show latest image while hovering

In QGIS 3.14 project I have a polygon layer with fixed names (zones) and I generate png figures (with pyqgis script) with the name of the zone to show them...

Asked on 12/19/2020 by yky

0 answer

Create a PL/PSQL function that performs as fast as a normal query?

I'm trying to create a PL/psql function that cuts one user-defined geometry to a predefined border geometry.If the user-defined geometry does not intersect with the border geometry, it should...

Asked on 12/19/2020 by Jonas Olsen

1 answer

Are there newer routing algorithms (than Dijkstra, A*) in GIS databases?

There are works like Reach for A* from Microsoft researchers and Highway Hierarchies by Sanders and Schtolz (if I spell the name correctly) from Karlsruhe Uni. Both...

Asked on 12/19/2020 by culebrón

3 answer

How to adjust the resolution of one raster to the resolution of another raster

I have two rasters, both showing forest cover. I eventually want to use one to mask the other, so I'm trying to get them to the same extent and resolution....

Asked on 12/19/2020 by Nadav Bendavid

1 answer

Error message using sDNA Prepare Network

I'm preparing a road network using the sDNA Prepare Network tool on QGIS 2.18.28. My OS is Windows 10 64 bit. I get the following error message:Algorithm Prepare Network...

Asked on 12/18/2020 by pyyang

1 answer

Reclassify function in ArcMap 10.5 does not correctly reclassify values?

I reclassified a raster layer containing three classes (0-0.05, color = white; 0.05-0.5, color = dark salmon; and 0.5-1, color = red) to...

Asked on 12/18/2020 by FlyingDutch

1 answer

Map extent matching permanently main canvas extent

Refreshing the map extent on QGIS's composer requires to click on Set map extent to match main canvas extent I...

Asked on 12/18/2020 by Remi.M

2 answer

Changing style of only selected polygons in L.geoJSON layer?

So, I'm going to show a lot of polygons in my Leaflet map but I need an id for each polygon, the URL comes in a path like this. In...

Asked on 12/18/2020

1 answer

Changing the color of every entity of GeoJSON layer in OpenLayers 6.4.3

I would like to change the color of every entity of my GeoJSON, like in the picture. For now I can just change all the features with the same color....

Asked on 12/18/2020

1 answer

ArcPy: How best to handle output that could be a shapefile or feature class?

In many Esri examples, including this one, they code in the output ".shp". What is the best way if you want to be able to handle...

Asked on 12/18/2020

1 answer

Ask a Question

Get help from others!

Geographic Information Systems : Recent Questions and Answers (Page 478)

Ask a Question