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Geographic Information Systems : Recent Questions and Answers (Page 54)

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

How do I get Table from Vector layers for use with joinattributestable

I am attempting to run: processing.runandload('qgis:joinattributestable', layer1, layer2, 'id', 'id', None) To join my tables and output to a temporary viewing layer. layer1 and layer2 are both Spatialite imports. They...

Asked on 09/26/2021 by IceDreamer

1 answer

Apply reduction without time pixels reducing

I'm having a little bit of trouble reducing the NDVI band of my data, without reducing the time bands. What I want is to apply a 95th percentile reducer to...

Asked on 09/25/2021

1 answer

Creating fishnet grid Shapefile in QGIS?

How do I create a fishnet shapefile using QGIS? The equivalent task of "Create Fishnet" in ArcGIS....

Asked on 09/25/2021 by bcollins

5 answer

Linestring table (of MultiLinestrings) ST_Intersection

I'm moving from GeoPandas to PostGIS and GeoAlchemy. I've a table full of multilinestring geometries (timezones from NaturalEarth.com) and I've a linestring which represents what will be the route of...

Asked on 09/25/2021

1 answer

Steps for installing new GDAL version for Python in Ubuntu 18.04

If I'm installing the GDAL stock version from Ubuntu 18.04 then the installed version is 2.2 and I need at least 3.0.4 to better handle Sentinel 2 data. Is there...

Asked on 09/25/2021

1 answer

Classified image using RF method in R displays less no. of classes than it was trained to

I am trying to classify crops using Sentinel-2 image including 10 classes, using randomForest classification in R. For that, I extracted 2000 random samples points from the training areas for...

Asked on 09/25/2021 by UshaP

0 answer

Stream network using multiple cell thresh holds inArcGIS

I'm trying to create a stream network with drainagelines formed at varying thresh holds throughout a drainage basin. Is there any way of doing with Arc and still creating a...

Asked on 09/25/2021 by LehighAndy

1 answer

File format for specifying GPS motion as a function of time?

What file format can specify GPS lat/lon/elev time history? If I want to specify vehicle or pedestrian motion along a waypoint path, what is a compact way of specifying this?...

Asked on 09/25/2021 by Marc Compere

3 answer

Algorithm for offsetting a latitude/longitude by some amount of meters

I'm looking for an algorithm which when given a latitude and longitude pair and a vector translation in meters in Cartesian coordinates (x,y) would give me a new coordinate. Sort...

Asked on 09/25/2021

8 answer

Concatenating part of string and sorting it using QGIS

I'd like to know how to concatenate part of a string and sort it. For example, i have a FIELD1 (string) and i should have the numbers of the string...

Asked on 09/25/2021

1 answer

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