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Geographic Information Systems : Recent Questions and Answers (Page 93)

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

Expression with two groups

I have a shapefile that contains building footprints with multiple addresses with different functions (with each an usable area).I would like to calculate the sum of the usable area,...

Asked on 08/09/2021

2 answer

Classification with L8 Raw scenes VS L8 Surface Reflectance using Google Earth Engine

I have created a classification using Google Earth Engine following the tutorial using ee.Algorithms.Landsat.simpleComposite.I know the algorithm only uses raw scenes (as the...

Asked on 08/09/2021 by Petr Janoš

0 answer

Is this ST_Relate result expected?

The following PostGIS query involving ST_Relate gives FFFFFF102 as its result:SELECT ST_Relate( ST_GeomFromText('POLYGON EMPTY'), ST_GeomFromText('MULTILINESTRING((0 0,0 1),(0 1,1 1,1 0,0 0))'), 1);I would...

Asked on 08/08/2021 by Peter Stace

1 answer

Distance between labels? QGIS3.18

It is necessary that the labels are evenly spaced relative to each other and do not clump together. Where can I specify the parameter in the settings: the distance between...

Asked on 08/08/2021

0 answer

Creating Minimum Convex Polygon - Home Range from Points in QGIS

I just downloaded QGIS (3.0.2) and trying to create minimum convex polygon around points using minimum bounding geometry (convex hull). The videos and help documents I see online appear to...

Asked on 08/08/2021 by Phil Allman

7 answer

Empty TIFF files while exporting images using Google Earth Engine

I am trying to export aerial images of a city in Japan. I have specified a polygon geometry of the location and also specified it as region in export. But...

Asked on 08/08/2021 by stalker_of_the_stack

1 answer

How to calculate pixel area of a clipped image in Google Earth Engine?

I calculated NDVI using Sentinel 2 image collection by mapping a function over the image collection and then returning the expression inside the function as a band .addBands(expression).rename('NDVI') Upon printing,...

Asked on 08/08/2021 by user173819

1 answer

GeoJSON Datastore and GeoServer

I found a way that should allow to use (Geo-)JSON flies with GeoServer: An unsupported GeoTools GeoJSON Datastore (thanks to this answer) Here is a link to the jar:...

Asked on 08/08/2021 by jonsken

2 answer

QGIS 3.16 – Maptip shows contents only once

I'm working with QGIS version 3.16.0-Hannover on both Mac and Windows OS and I encounter the same problem with using map tip. I added images and videos to point location...

Asked on 08/08/2021 by giulio89

0 answer

Tracing not working with DWG-turned-KMZ file in QGIS

I have this layer that came from a CAD software and was converted to KMZ so I can use in GIS (somehow the DWG and DXF doesn't import properly in...

Asked on 08/08/2021

0 answer

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