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i am trying to render a map with Mapnik via Python. Therefore I first created a style file (as XML) and my code looks so far: m = mapnik.Map(400, 400)style = 'osm.xml'mapnik.load_map(m, style)box = mapnik.Box2d(347950, 5207105, 425404, 5316784)m.zoom_to_box(box)mapnik.render_to_file(m...

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I have made a tile pyramid of a number of Dutch topographical maps using gdal2tiles. This gives apart from the tiles openlayers.html and tilemapresource.xml. The openlayers shows perfectly and correctly aligned with respect with the osm layer in a browser. However, I would like to view them as...

I am having some trouble in inserting long/lat in the form of point. Currently, I have array of long/lat value and which I want to store into database in the form of point. However, I am unable to store it in the form of point and when I query as ST_AsText(geom), I simply get long/lat value not...

I have some data in a csv file. One of the interested variable is test done (1=done, 2=not done). There is a variable of county name in which I would like to join with a county shape file. I only know how to join them using the county file as the base using Arcgis, but the interested variable...

I am using postgreSQL, postGIS and pgrouting. Now I am really confused on how am I going to find the shortest path between multiple points. I know how to find it between two points through dijkstra but I am confused how to accomplish the same result with more than two points. I have done...

I have read al lot of the pgrouting, but i still not quite sure if it can do what i want. I have 20 stop points and i have 1 starting point and 1 finish point. I want to calculate the shortest path between starting point, all 20 stop point and finish point. Its something like delivering...

I wrote this part of code: SELECT CB.id_2 AS CountyID, CA.id_2 AS NeighbourCountyID FROM "Counties10B" CB,"Counties10" CAWHERE ST_Intersects(CA.geog,CB.geog);But it does not use spatial index. What could be a problem? Indexes are created on both table. أكثر...

Bonsoir, je cherche à convertir un raster (image Landsat) en vecteur, j'utilise l'outil polygoniser un message d'erreur me dit que le fichier raster n'existe pas dans le fichier système. question: est-ce que je doit mettre mon ratser dans le fichier système pour que ça marche et si oui, où...

I am a newbie in spatial database, so I am having lots of issues even in small tasks and now I am having some issue with inserting data to the table. I have followed the postgis documentation but however, I'm getting some error while inserting data to the table. In the code below, I am trying to...

I have an ArcGIS table in a file geodatabase that contains a date field. I would like to write a python (arcpy) function that creates and returns a table view for a date-range given a starting and/or ending date. Here's what I have so far: def get_date_range_table_view(grid_table...

I have an elevation raster map, a point, a raster map defining the viewshed from that point, and now I want to produce another raster map with the results of a function of the distance between the point and every point (cell) in the elevation map that has a defined value (not equal to 180) in...

I am new to R and using the raster package. I have a problem extracting polygons from an existing raster file. If I use extract(raster, poly_shape)function on the raster it always creates a list with the data. What I really want is to extract another raster file that I can load with ArcGIS...

UAV monitoring of large scale environmental projects, utilising photogrammetry as a tool. This is a collaborative monitoring and technological advancement project between SEACAMS (Bangor) and DTM Technologies (www.dtm-tech.co.uk). This is a video showing the sand dune remobilisation project at...

This has to be one of the more challenging scanning projects and one that may have produced one of the most important discoveries. Homo naledi was discovered in the Rising Star caves in the Cradle of... Click Title to Continue Reading... أكثر...

السلام عليكم ورحمة الله وبركاته أرجو من أعضاء المنتدى الكرام مساعدتى في الحصول على أية خرائط موضح عليها التقيسيم الإدارى لمحافظة مطروح على... أكثر...

Is there a way to create a polygon using the visible extension of a data frame in the model builder? I'm using arcgis 10.0. thanks for help. أكثر...

Bonjour, Dans le cadre de mon master j'ai de nombreuses applications à réaliser sur le logiciel QGIS. Pour pouvoir travailler à mon domicile j'ai donc installer le logiciel sur mon ordinateur personnel (mac). Je suis donc complètement novice sur le logiciel. Je rencontre des problème lors...

I am just starting creating a web application for displaying maps about Afghanistan as my job requires me to. I wonder if anyone could help me with a reference about using openlayers3 with geoserver with some practical examples. أكثر...