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I have a table called Stores with 10k rows which has a column location geometry(Point,4326). CREATE INDEX "Stores_spatial_gix"ON "Stores"USING gist(location);Upon KNN query explain analyze select * from "Stores" order by ST_distance_sphere(location,st_point(-82.373978, 29.633657)) limit 3I...

It is supposed that for using Shooting star function in pgrouting, we need to have RULE and TO_COST fields in our table, but OSM2PO hasn't created those fields. what must i do for OSM2PO takes into consideration the turn restrictions? أكثر...

Imagine you find an interesting location in Google Earth. This video will show you how to create a track to your point of interest and transfer the data to a GPS. Once this is done, you can use the GPS to take you within a few meters of your point of interest. You can also ... أكثر...

The following is a brief introduction to photogrammetry and remote sensing for those who are new with the technology, written by Anil Narendran Pillai, Vice President – Geomatics at SBL. The post A Brief Introduction to Photogrammetry and Remote Sensing appeared first on GIS Lounge. أكثر...

I search for a good wms server that support Postgis at the end I found Mapserver as the fastest and best choice. Every performance test say it's faster than Geoserver because of it's native compiled code. Then when we developed our server side using Mapscript (the mapserver extension for...

I would like to write code for creating a thematic map. The GUI command in Mapbasic window shows many lines in order to set up the different colours which will be used on the different polygons (i.e. Brush (2, 16760, 2300)). Is it possible to generate this part automatically provided the...

GIS247 takes a brief look at recent developments in GIS. أكثر...

I want to create a free public ArcGis account to create some storymaps.Afterwards i want to share/publish this storymaps on my website. This website is off a travel agency. So is it legal to use this self created story maps by a free public account on this website? Because this story maps gives...

I have created a NDVI image from Landsat 7 data using ERDAS (veg_NDVI.gmd). This model was already in ERDAS 9.3. After creation the final output visually highlighting vegetative areas but the value showing 0-255. But theoretically it is known that the NDVI value ranges from (-1) to (+1). Please...

What does "Information [18]: Select at least one signature" in the semi automatic cla I am using the semi automatic classification plug in to classify vegetation and water in a satellite image. I create training shp and signature list. When i hit "classification preview" it gives me the error...

If you follow my blog, you’ve most certainly seen the post How to create illuminated contours, Tanaka-style from earlier this year. As Victor Olaya noted correctly in the comments, the workflow to create this effect lends itself perfectly to being automated with a Processing model. The model...

I'm Using GMap.Net Library . I need to know how to calculate the Eye Altitude for each zoom level like google earth. أكثر...

I have a network shapefile that between its vertices , there are edges that have multiple geometric objects. When I try to node it in postgis, it creates multiple edges that topologically are actually one single edge. Could someone please let me know how I could reconstruct the network to have a...

Is there a way or a tool to mimic "find and replace" functionality in a Geodatabase (File, Persoanl, Enterprise). For example I need to remove a string from all FeaturClass names. for example in the following cases, I need to remove "Pattern_": Pattern_Road1 Pattern_Parcel Pattern_Buildings...

reclass = function(x){ ifelse(x == 0, 10, ifelse(x > 0 & x

iRacing's team of nearly a dozen laser scanning technicians, photographers and artists recently completed their data-gathering work Continue reading → Click Title to Continue Reading... أكثر...

I have downloaded some landsat 8 bands. I need to prepare multi band raster (from bands 2,3,4) and then save this composite raster. I can prepare the composite raster in image analysis window but when I want to save this raster it takes me long time (5, 6 minutes). Same problem is happening...

I've installed postgresql/postgis and pgrouting and I need to download OSM data to be able to provide the shortest path between two points on an openlayers/google map. The problem is that I can't find a tool to download the data to my database (In fact I've found a tool named osm2pgrouting but I...

I have a polygon layer of suburbs (with population density) and I have separate layers of POI such as hospitals, government buildings etc. What I'd like to do is give each POI a radius based on how important I think they are (such as a private vs government hospital - from the attribute table)...

I am a GIS beginner, and I have a question about how to get the distance between two points in meters instead of decimal degree. In QGIS 2.4 I have a project with two point layers (in WGS84). From both layers I used I wanted to have the distance in meters between the two closest point between...