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Geographic Information Systems : Recent Questions and Answers (Page 29)

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

Compatibilty issue of pyexiv2 and ctypes module in QGIS 3.10

I'm trying to install a python module called pyexiv2 onto QGIS 3.10, I've noticed this module doesn't work. Although the module's installation seems to process well python -m install pyexiv2...

Asked on 11/06/2021

1 answer

Zonal stats for raster in PostGIS

I am trying to do zonal stat in PostGIS with the following command.SELECT (ST_SummaryStats(ST_Clip(agri_final_proj.rast, district.geom, TRUE))).*, district.district_1 AS district_1, district.geom...

Asked on 11/06/2021

1 answer

Get all rows that have geometries which intersect with a geometry in any row of a different table in an effective way

I have two PostGIS tables containing thousands of geographic polygons each (each row has one polygon and numerous other attributes). Both tables represent different data sets but cover the same...

Asked on 11/06/2021

1 answer

Routing Layer does not show on Leaflet Map

I am trying to develop a routing application. I have published my layers and SQL view on GeoServer. Currently I am trying to display my pgRouting Layer on my leaflet...

Asked on 11/06/2021

1 answer

Query an ArcGIS Online FC via an HTTP request

I have data that is hosted by ArcGIS Online. I want to query ArcGIS Online via an HTTP request. The response would be a JSON object (similar to ...

Asked on 11/06/2021

2 answer

Using SAGA tool in PyQGIS standalone script. Output doesn't return vector layer

In my standalone script I want to use the SAGA tool "merge vector layers". According to the docs I need the following. Thus, I wrote the following...

Asked on 11/06/2021

1 answer

Adding input field to field map using ArcPy gives RuntimeError

I'm a Python beginner and I would like to export a csv from a feature class, including only some fields. I'm trying to do it using the field mapping control,...

Asked on 11/06/2021

1 answer

Issue with circular patterns showing up after orthographic projection

For a project I'm working on, I'm trying to project a GOES-16 image to an orthographic projection centred at the continental United States. In a later stage, I found these...

Asked on 11/06/2021

0 answer

Problem with GeoServer GeoWebCache

I have a problem. My objective is to do the cache of a WMS service, imagining that I have a layer with a digit ('1' or '2'), and have a...

Asked on 11/06/2021

0 answer

Is it okay to do analysis on coarse rainfall data, since the area calculations can be highly misleading

I need to find the area of different classes within the rainfall data, which will be pixel-based, and since coarser data may under and over cover the study area (image...

Asked on 11/06/2021

0 answer

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