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Geographic Information Systems : Recent Questions and Answers (Page 30)

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

Downloading new WorldClim version 2.1 bioclimatic variables for specific region of world using R

I want to download the new (19) WorldClim Bioclimatic variables (version 2.1) for a specific region of the world, but it looks like you can only download...

Asked on 11/06/2021

1 answer

Open raster referenced in attribute column of vector layer

I have a polygon layer. One of the columns holds an absolute path to a (georeferenced) raster. Is there a way to (programmatically) open this raster in QGIS and add...

Asked on 11/06/2021

1 answer

Overwrite in ArcGIS Portal hangs for hosted GeoJSON and FGDB

I'm attempting to use the 'Overwrite' tool inside of ArcGIS Portal, on a existing hosted Feature Layers that have Hosted datasets.I can successfully 'Add Item' from the ArcGIS Portal...

Asked on 11/01/2021

1 answer

Image Dodging (color matching algorithm) in ERDAS

I have two LISS 3 images acquired in Feb and March a year apart. I have performed atmospheric correction (haze reduction) for both the images individually before applying the color...

Asked on 11/01/2021

2 answer

OpenLayers bbox strategy does not work when zoom in

I am using OpenLayers 6 vector source and bbox loading strategy.this.source = new VectorSource({ format: new EsriJSON(), strategy: bbox, loader: this.loader(layer)});So, when I open tha app...

Asked on 11/01/2021

1 answer

Select By Location and Calculate Field in ArcPy

I have a point shapefile and a polygon shapefile and want to set the field "Present" to 1 if it intersects with the polygon in ArcPy, but I am having...

Asked on 11/01/2021

1 answer

How would I process and output every possible route of a stream network?

Starting with a stream network, I would like an output that includes every possible route from the lowest level stream to the highest level river as separate lines. Is this...

Asked on 11/01/2021 by sreiny

1 answer

How can the amount of columns/rows in a raster be altered?

I want to work with 5 raster sets in R. 3 of them are results of an Euclidian distance analysis (R1-3), 1 is from a kernel density analysis (R4) and...

Asked on 11/01/2021

2 answer

Match up two polygon layers in QGIS

I have two polygon layers, one is from natural earth data (Administrative 1 division) and the other is a polygon layer with some historical regions in Europe. As you can...

Asked on 11/01/2021

1 answer

Converting to geodetic latitude, longitude

I’m writing a program to determine a vector between two points on earth by taking the difference of the ECEF vectors for each point. I’m using this algorithm: ...

Asked on 11/01/2021

1 answer

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