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I'm trying to edit the values of attributes in QGIS, but it does not work. I tried to google an answer, but couldn't find anything so far. This is what I'm doing: Open QGIS. Drag in a GeoJSON file. It becomes a vector layer. Menu bar > Layer > Toggle Editing. I cannot toggle editing. It is...

Is there a way to set the labels size of font to fit the scale of the map in the composer window but also to fit in the main window? The map in the composer is size A0 and the scale is 1:5000. In order to see the labels clearly in the composer, I set the labels font size to 23. So in the main...

I am trying to see a WMS layer above Google maps API's satellite baselayer. When building the WMS URL string I am using WIDTH=256 and HEIGHT=256 which I think is the default. The thing is that the tiles are not matching one with another. It can be seen clearly in the following screenshot...

I want to segmentate a country (denmmark) by using barriers such as larger roads, railroads and the border/ coastline as the delimiting lines of the polygonise function in QGIS. But as most roads and railroads ends well before hitting the coastline I get some very long polygons along the coast...

I am doing my MSc. in Flood Risk Management and I have not yet started flood plain modelling or any modelling at all. The modelling courses will be given next year and I am a little bit curious to dive into some of them before time. So as a flood master, which flood modelling software...

Thousands of people flee to refugee camps every year due to humanitarian crisis. Ensuring that displaced remain safe and healthy relies on well planned satellite data. Zaatari refugee camp in Jordan is located in some 3km area. Located just 10km from the border with Syria, the camp is currently...

!!!-Exclusively for GIS AREA-!!! PacktPub - QGIS Blueprints Book Description Publication Date: July 28, 2015 About This Book Tame geographic information workflows with QGIS blueprints for smart web applications Create geographic web applications using QGIS and free/open...

I don't know much about GIS. I'm working in C#.I'm receiving latitude/longitude data and need to convert them to EPSG:2154. I've done some web search but I'm still not sure where to start.Is there some kind of library or code examples I could use ? أكثر...

I want to calculate scores in one field based on the percentile (in steps of 10) the row falls into in another field. I found a solution here (Calculating Percentiles in ArcMap?) that I tried out, but I now get the error: unsupported operand type(s) for *: 'numpy.ndarray' and 'numpy.ndarray'My...

I am working with openlayers 3 with a layer from mapbox or openstreetmap and I need to draw some circles on it. I am able to print the circles with a view with a projection EPSG:4326, but then I have no map. Changing the projection with a transform the map is displayed, but the points are all...

I have been given a task to compare two sets of points, one set being a set of predetermined points, on the other being a set of actual points that were taken in the field. I have to compare these two sets and come up with the statistical difference between the two sets using qgis. Could...

I am currently having some trouble adding the CRS to a vector file that I want to re project to WGS84/UTM. The shapefile is using Lambert Conformal Conic Projection; ITRF92 horizontal datum and GRS 1980 ellipsoid according to the metadata. I will like to know how to define the original CRS...

I'm hosting a variety of data using geoserver. Some psql, but mostly shapefiles. I have a layer group that has the drawing order set to draw the feature with the green square after the big red triangle. As you can see in the screenshots, this is not happening. The order is right on geoserver...

I am displaying some map extents by lat/long on map control by using shapefile writer of DotSpatial library. Now I want to display preview image within each extent that is selected. How can I achieve this? Link of sample screenshot is...

I would like to know if it's possible to do ArcMap style clip with QGIS.The operation I'd like to do, is to clip overlapping polygon(s) on the same layer with the selected polygon. For example I have 2 polygons which overlap each other on the same layer. I want to clip all overlapping...

How can I find the cells which lie on a straight line between two points?I.e. how can I find the indices of the cells (in grey) which are intersected by the line defined by the two points (in blue): I want to do this in order to read off values from the underlying DTM and thus extract the...

If anyone please, could gimme me a hand on this question.I have a web sql client that the user can write a sql statement and I want to sent it via WFS to geoserver, run it, and based on the results, to mark on map what I have found. So, I know that the geoserver supports views and I can send...

Bonjour, j'utilise Qgis depuis les versions 1.6 de mémoire. ET je constate que les dernières versions sont très très instables, pour ne pas dire impossibles à utiliser. Par exemple, depuis 2.8, le plugin go2streetview - simplement en modifiant la fenêtre de visualisation - fait très... أكثر...

Here is a catalog with short descriptions of different satellite sensors and download links: http://carpe.umd.edu/geospatial/satellite_imagery_resources.php أكثر...

I would like to delete several values as they are equal to zero. In my example, 0 -5 - 6 - 7 - 8 ... I couldn't find any anwer on the internet, thanks for your precious help! أكثر...