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Geographic Information Systems : Recent Questions and Answers (Page 88)

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

Visualizing Clusters with Google Earth Engine

I am using kMeans clustering to visual 3 clusters of an NDVI image. The clustering is always correct, but lower values could be green, when I want them to be...

Asked on 08/12/2021 by Blue101black

1 answer

Transforming Coordinates From ETRS89 into WGS84 has an 0.5m error. (Projected coordinates)

Original post had to do with software or OS bug.But when working with coordinates in ETRS89 (projected data), I was facing an issue in centimeter value when I transformed...

Asked on 08/12/2021 by Florjan

1 answer

How to dynamically query and visualize PostGIS data using GeoDjango and OpenLayers?

I am trying to implement dynamic query functionality in GeoDjango and OpenLayers. First, I filter the data and return it in GeoJSON format using Django serialize. Then, the return GeoJSON...

Asked on 08/12/2021 by Kamal Hossain

1 answer

Get layer by name, retrieve layer, in startup.py

I wrote a simple script in startup.py, but when I open a QGIS project, I appear a python error window.The "contratos" layer is a PostGIS layer. But I tried...

Asked on 08/12/2021 by vitorcsm

1 answer

pgsql2osm? How to generate osm files from osm2pgsql database?

I want a method to export osm files from a Postgres database. I already have an osm2pgsql database, an apidb database, and a nominatim database in which I have...

Asked on 08/12/2021

1 answer

How to do a regex negative lookahead in a ee.String.replace()?

I thought this would work, but it doesn't:var someText = ee.String("1_2_text").replace('(?:d_)*(?!d)','').aside(print)I would expect 1_2_ to be matched and replaced with nothing. Instead I am getting the following error:String...

Asked on 08/12/2021

1 answer

GDAL Python Function to convert vector files from shapefile to KML

I want to convert a shapefile with polygon to KML file using GDAL Python.For this I created a fuction with two arguments (input and output) and it works, but...

Asked on 08/12/2021 by user153770

0 answer

Carto Recognizing OSM locations

I have downloaded a CSV data set from Uber, but it gives locations in terms of Open Street Map IDs (and start and end node IDs) which Carto is not...

Asked on 08/12/2021 by user180814

0 answer

Resetting Label and Callout positioning for a single Label in QGIS

I accidentally altered the endpoints for a callout and cannot figure out how to reset them. I tried a number of key combinations while clicking the endpoints but nothing seems...

Asked on 08/11/2021

1 answer

Using Batch Raster Calculator in QGIS

I am new to QGIS. I want to subtract a sequence of rasters (daily data): one day from the previous.day100-day99; dayy99-day98; day98-day97 and so on, with file names that...

Asked on 08/11/2021

1 answer

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