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A brief explanation*of Datum and why there are so many different Datum around the world. It also explains why Google Earth uses WGS84. أكثر...

skunkbear: When can I see the supermoon eclipse tomorrow night? On Sunday night, people in parts of western Europe, western Africa, North America and all of South America will be able to see a lunar eclipse. And this one’s extra special, because the moon will be at its perigee – the closest...

I have a very large QGis raster layer showing the differences between two nearly identical rasters. Because of this, it is very difficult to find where in this layer the few pixels that are different occur. I have thought that one way to find them might be to have QGis zoom in and center on...

What is wrong here? PyScripter reports that the script runs ok, but it still doesn't print correctly (doesn't print anything). fc_list = arcpy.ListFeatureClasses('','') fc_count = len(fc_list) if fc_count == True: print ("\nFeatureClasses:") for fc in fc_list...

السلام عليكم ورحمة الله وبركاته http://www.arabgeographers.net/up/uploads/14433833231.zip أكثر...

I would like to download the new released maps (2014) SRTM1 but where can we find them? Is there an FTP server to download the whole images? أكثر...

I have an attribute table of xy points that I have plotted on a map, and a shapefile that divides the map into 46 different areas. I want to add a field/variable to the table containing the xy points, that states which area of the map the point is located. How do I go about doing this...

Super rookie question I'm sure, but I need help using the leaflet plugin geojson-vt. According to tutorials, like this one on http://bl.ocks.org/Sumbera/c67e5551b21c68dc8299, there should be a js file called geojson-vt-dev.js. When I download the zipfile from GitHub I get 6 different js files in...

I am using GRASS GIS 7. When I try to install "v.kriging" module using "g.extension" command, it is not installed. Though it says that the extension is successfully installed, I get the error "'v.kriging' is not recognized as an internal or external command, operable program or batch file." I...

If I make a map in QGIS export it with Leaflet the symbology and labels don't appear on the webmap. Is it possible to export them? If yes, how to export the all map? أكثر...

This short course forms Part III in the Short Course series ‘Open Science goes Geo’. Part III covers various forms of research results including algorithms, numerical models, geo-samples, virtual workspaces, and further aspects of Open Science such as metrics, persistent identifiers, and...

Bonjour, j'ai des relevés de la végétation sur Excel (en pièce jointe) ; y'a-t-il quelqu'un qui peut m'aider sur ce sujet. Comment puis-je cartographier telles données. Pièce jointe 7857 (http://www.forumsig.org/attachment.php?attachmentid=7857) Merci أكثر...

I have a map uploaded to QGIS Cloud, and I am trying to get access for my partner to use it as a WMS. This is what I see: It would appear that WMS is on, but those checkboxes are unclickable. The link for my map's WMS looks like this: http://qgiscloud.com/my_username/my_map_name/wms but I...

I have a particular .asc file, with elevation data in it.I am wondering if somebody knows, what is the unit for the "cellsize" variable in the header of the .asc file? Here is how the header looks like: ncols 236nrows 121xllcorner 2.022083333yllcorner 41.32875cellsize...

السلام عليكم ورحمة الله وبركاته يبدأ بعد ساعات قليلة عام دراسي جديد فى مصرنا الغالية حيث يستعد ملايين الطلاب للذهاب إلى مدارسهم ، أرجو أن يوفق... أكثر...

I am kinda new to openlayers and not (yet) very experienced in javascript. Can anyone tell me what I am doing wrong here? I have a wordpress blog and I want to replicate and adjust the following script to my needs: http://jsfiddle.net/eqsrnjos/1/ With one big exception: I need to load the...

I have 2 point vector layers wich differ in 2 fields while both of them have the same number of fields (10).What I want to do is produce a new point vector layer with 12 fields.When I join the two layers I have as a result a new vector layer which holds all fields from both attribute...

Explanation of filters and options in AutoCAD Map 3D on point cloud to create surfaces that can be used in Infraworks أكثر...

I wish to join one field from a shapefile to another shapefile within the QGIS graphical modeler. I am aware that there is a 'Join attributes table' algorithm but this joins all of the fields from the shapefile. Outside of the graphical modeler I can use the Joins process in the layer...

Bonjour, Je souhaiterai avoir un tuto ou m'aider à installer et l أكثر...