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I am doing an astronomy project. I want to have the information about our images stored in a spatially enabled database. This, I would think, should be a very easy special case for GIS functions because the sky can be treated as perfectly spherical, and does not require an elliptical treatment...

Google Earth is an awesome tool and an impressive achievement. It redefined how people all around the world think about location information. There are no doubts about that. Not everyone knows that besides browsing satellite images, Google Earth allows you to add your own data layers directly...

I am working with leaflet api, where user draw shapes on images. Clearly i am having problem with polyline decorator because clearlayer method doesn't seem to work for decorators, might be a bug or owner haven't implemented it yet. When i try to clear layers, it give console error Console...

I add new feature on the layer of shapefile saved it, and when i tried to calculate shortest path qgis tell me that path not found. Please tell me why it happening. أكثر...

I have to do Isochrone driving / public transport map. It would seem that the two better open-source solutions are grass and postgis. Could you tell me which one is the better? the easier to implement? I' m working with a windows 7 32 bits (So i am limited by the memory capacity). Last time...

I am beginner in GeoServer. I was able to do some task by my professor they want me to change different size of points in map of GeoServer example I have my database named "PLACES"then these are the data inside the database. Name Place Addr:city Baluarte...

In my transport geography class, we were asked to do a "best guess" on the route which does the following on this graph: Starts at A Visits each node Returns to A minimizes distance. I wrote up program which calculated all of the five step paths that started from A, visited every node, and...

I am working on a web/mobile application based on location data. Since i am already familiar with MongoDB, i found the geospatial indexing of mongo is quite suitable for my needs. As i am mainly dealing with simple/short location points, Mongo 2d indexing is good for me. Along the way i picked...

I have written many Python scripts using arcpy in ArcGIS 10, and so far my only means of debugging is restricted to printing messages to the geoprocessing results window using arcpy.AddMessage(). Are there any other options out there, such as setting break points? This would save a lot of time...

Which character-encoding is used by the dbf-file in Shape-files? It seems it is handled different, based on the program and the local encoding-settings of the machine. Which encoding is 'right' - specified for the format? أكثر...

كلنا نعلم بوجود البرنامج المعرف جدا جوجل ايرث من شركة جوجل ، والذي يخول لك مشاهدة أي منطقة على وجه الكرة الأرضية ، لكن ما لا يعلمه الكثيرون أنك قد تستغني على هذا البرنامج إذا كنت لا تريد أن يأخد مساحة على القرص الصلب الخاص بجهازك ، وتستعين بموقع flashearth الذي يتمتع بواجهة سهلة جدا ومن خلاله...

I was looking into PostGIS and its defined Spatial Reference Systems, and I found that some have no proj4. Why don't they? SELECT auth_name || ':' || auth_srid, proj4text FROM spatial_ref_sys ORDER BY proj4text "EPSG:22300";"" "EPSG:29701";"" "EPSG:3577";"+proj=aea...

I'm new to PostGIS and pgRouting and I'm using the pgr_dijkstra functionality and I need to convert the values it returns in the format lat/long, is that possible? If so, how? أكثر...

Do you know reason, why some ArcGIS tools (like Clip and Intersect) modifies number of vertices, even if the feature is not modified itself? Like on picture, I use Clip and Intersect on line with polygon. The line has 26 vertices before executing function. After, the line has 517 vertices even...

I am new to Open Layers and have searched far and wide trying to figure out how to programmatically add layers with a default set of parameters from a selected source path, but Google has not produced any meaningful results (at least that I can identify). I have generated a set of thumbnails...

I am working in ArcGIS 10.1 with non-spatial Oracle tables. These tables have a field named 'objectid' because were created originally for inserting/updating records by using ArcGIS instead, not oracle. However, my goal is being able to use SQL developer for inserting big loads of data, but I...

I'm trying to create a basic model using QGIS, the QGIS graphical modeler and the sextante toolbar. In part of the model, I need to select features based upon multiple attribute values (for example - A = 'value' OR A = 'another value'). The select by attribute algorithm provided by QGIS only...

I'm trying to carry out weather conditions interpolations. I have information of 92 weather stations for 800,000 km2. As you can imagine the extension of land is huge and I need some kind or weather forecasting models to predict wind velocity and direction and solar irradiation for points in...

I'm having a lot of trouble getting Orfeo toolbox and Qgis 2.0 working. I followed the qgis wiki instructios, added the ppa, installed qgis 1.9 (it's beautiful, great work!). But when i tried to install the otblib from the ubuntugis repositories, it forces an uninstall of Qgis. Any ideas ...

Is there a way to label a layer using its file name or layer name (if I'd change it in Layers window TOC)? I tried some functions but I'm not good on that. I have lots of shapes (lines) and it would be easy to identify them this way. Of course, this name could be a table attribute but I'm...