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1500 questions
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votes
4 answers

How to edit the GDAL/OGR console call in QGIS 3.0?

In QGIS 2.XX, the drop-down menu bar tools had an editable call box at the bottom, where commands not available in the gui could be manually entered (by clicking a pencil button). In 3.0, the menu bar tools are the same as the GDAL tools found in…
user77942
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1 answer

Seeking embeddable web-based maps

Some of the ones I'm familiar with (in no particular order): Google Maps (http://code.google.com/apis/maps/index.html) Bing Maps (http://www.microsoft.com/maps/developers/) Yahoo Maps (http://developer.yahoo.com/maps/) MapQuest…
Jon Bringhurst
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17
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5 answers

Doing heatmap from line data in QGIS?

I want to perform a line density analysis for my line data, based on an attribute. The heatmap option (kernel density analysis) seems to be only possible for point data. I have tried to convert my line data into points, and create a heatmap, but…
user110637
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1 answer

Where does the default Earth radius in ST_Distance_Sphere come from?

MySQL says in the docs for ST_Distance_Sphere Calculations use a spherical earth and a configurable radius. The optional radius argument should be given in meters. If omitted, the default radius is 6,370,986 meters. If the radius argument is…
Evan Carroll
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17
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2 answers

Understanding web mapping tools

I've been trying to understand GIS tools and applications to achieve the following: Build my own basemap Publish the basemap online Add my own data layers to the online basemap Perform analysis (on-the-fly) Add interactivity to the map In my first…
KaushikTD
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17
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1 answer

Understanding reprojection?

One thing that I can't quite get my head around is Reprojection. It comes up a lot in questions on Stack Exchange, and there are plenty of How to questions and answers about specific issues using various software. I have searched the web with "What…
Martin Hügi
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17
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10 answers

Blogs about digital cartography?

I´m looking for blogs or good websites about digital/web cartography...i´m not really interested in the deep technical ramblings (i´ve the forum lists for that) but rather inspirational blogs which showcase great digital cartographic techniques or…
Robert Buckley
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17
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1 answer

Should I always be using BIGTIFF=YES as default?

I sometimes write short scripts/work instructions for colleagues who are not very skilled at GDAL / programming in general. To prevent any problems with the scripts, when merging/converting geotiffs with GDAL, I try to just use the BIGTIFF=YES…
miln40
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17
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3 answers

Visual Impact Assessment in QGIS or GRASS

Is it possible using QGIS or GRASS to perform a Zone of Visual Impact assessment? E.g. where can a 100m high structure be seen at a viewing height of 1.8m within 30km, taking into account elevation (also maybe buildings and wooded areas)? I'm pretty…
Simon
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17
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5 answers

Looking for a FREE Cloud based 'Web Mapping Stack' Host

Any pointers to free cloud-based geoweb hosts? Use case: To display a basic interactive web map in Leaflet/ OpenLayers with data hosted in PostGIS served by GeoServer. I am looking at something very close to the OpenGeoSuite since I am playing with…
Erick
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17
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1 answer

Does GDAL support parallel processing?

I would like to speed up the process corresponding to this command: gdalwarp -t_srs EPSG:4326 -overwrite input.ntf output.tif Is there a way to use parallel processing in GDAL? Semi-offtopic: If not, do you recommend a non-GDAL solution to speeding…
Matt Kleinsmith
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17
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1 answer

How to load Ordnance Survey OpenSpace in QGIS?

The version of gvSIG that I have on my Android tablet will load OS OpenSpace layers and I wonder whether or not it would be possible for QGIS desktop to do the same? And if so, how? I have my own OpenSpace API key. This appears to be the (long) line…
nhopton
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17
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3 answers

Leaflet: How to add a marker to, or remove it from, a Leaflet map?

On Leaflet, I am drawing a marker everytime the user click on the map like this: function getClickedLanLon(e) { var lat, lon, zoom; lat = e.latlng.lat; lon = e.latlng.lng; zoom = map.getZoom(); marker2 = new…
McLan
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17
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2 answers

Getting distance meter value between two geometries in PostGIS

I am using PostGIS. I would like to get the distance between two geometries. I am using this sid : 4269 in meters what i am doing now is this : ST_Distance((a.geom,b.geom)) FROM ... but I am getting result in degrees. I think that I should work with…
YassineGeoma
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17
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7 answers

Get Raster Values from a Polygon Overlay in Opensource GIS Solutions

I have two layers. A polygon-shape-layer with many tiles and a raster-layer containing CORINE 2006 land cover with many categories in a colourmap. I want to obtain for each polygon in the shapelayer a sum of each land cover category of the…
Curlew
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