gis

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GIS: How to resize layer using .prj (WKT) projection? (Geographic Coordinate System)

Briefly: How to parametrize .prj WKT file so that I can perform 7 point tranformation (wiki). I know how false_easting and false_northing params work, but how can I adjust scale? I do not mean scale_[详细]

2023-03-18 09:50 分类：问答
how reprojections are done with srid = -1

I get a huge doubt, I have a shape file that I introduced to postgres and I didn\'t specify an srid, so the_geom column has -1 in the srid, when I start any other map viwers like QGis or MapSertver I[详细]

2023-03-16 15:48 分类：问答
What is the best way to store geodata (spatial data) for a small open source web application

I\'m about to start developing a GIS web application. I\'ll use PHP as language, Zend as Framework and Google Maps API for map rendering, but I didn\'t decided which back-end storage I\'m going to us[详细]

2023-03-16 01:14 分类：问答
Cluster points in PostGIS

I\'m building an application that pulls lat/long values from a database and plots them on a Google Map. There could be thousands of data points so I \"cluster\" points close to each other so the user[详细]

2023-03-15 15:08 分类：问答
How would I write this spatial query?

I have the following table structure: column names : celllongitude latitude bcchbsic data types: varchar doubledoubledouble double[详细]

2023-03-14 16:31 分类：问答
GIS with Bing Silverlight and SQL 2008?

I have data that I want to create a GIS type application that will have the typical features of adding and removing layers of different types. What is the best architectural approach?[详细]

2023-03-13 16:44 分类：问答
Local version of Google Maps API

Do you guys know if there is a version of the Google Maps API for C++ which works using local maps rather than having to connect to a Google server?[详细]

2023-03-13 13:30 分类：问答
Find all coordinates within a circle in geographic data in python

I\'ve got millions of geographic points.For each one of these, I want to find all \"neighboring points,\" i.e., all other points within some radius, say a few hundred meters.[详细]

2023-03-13 05:12 分类：问答
Elevation Values using Nasa WorldWind SDK

I\'m currently using Nasa worldwind SDK so as to get the exact elevation of a precise point on Earth . The 开发者_JAVA百科problem is that i\'m getting wrong values . I don\'t know if it\'s related to[详细]

2023-03-12 20:31 分类：问答
How secure are GeoLocation APIs on Mobile Devices?

How easy is it to hack or provide mis-information to a website via a GeoLocation API? I have a need to have users post their position to my server, but I need to ensure that the data is not spoofed.[详细]

2023-03-12 00:42 分类：问答