Do you suggest Mapstraction (library) as a layer to access Google maps? Is it an actively maintained project? Do I stand to again/ lose anything by using this library apart from the primary reason that its provider independent? ...
Hello...my question is similar to other friend posted here...we are trying to develop an application that supports possibly terabytes of information based on a land registry in Paraguay with images and normal data. The problem is that we want to reduce the cost of operation to minimum as possible because it´s like a competition between...
Is there a way of programmatically determining a rough geographical position of a mobile phone using J2ME application, for example determining the current cell? This question especially applies to non-GPS enabled devices. I am not looking for a set of geographical coordinates, but an ability for a user to define location specific softw...
I am trying to take a shapefile of subdivisions within a county that I have created and line it up with another shapefile that was given to me by the County Appraisal District (parcel data). When I try to get them to line up then my streets shapefiles is not aligned with everything else. They are all on the same coordinate system and I...
I'm working on a project that contains Thomas Brothers Map page and grid numbers. Is there a way to programatically convert from this map page to a latitude & longitude? An Example would be for the intersection of the US101 & I405 freeways. ThomasBrothers: 561-3G (page-grid) ...
What exactly is GIS? ...
Hello, I am developing a map control in WPF with C#. I am using a canvas control e.g. 400 x 200 which is assigned a map area of e.g. 2,000m x 1,000m. The scale of the map would be: canvas_size_in_meters / real_size_in_meters. I want to find the canvas_size_in_meters. The canvas.ActualWidth gives the Width in DIU's (Device Independan...
How many programmers on this site work with GIS? What middleware do you work with? ESRI? Mapguide? Google? What kind of projects do you work on? Are you focused on web work, making desktop applications or intranet projects? What kind of industries do you work in? ...
I once read about an open source database for postal codes with geolocation data but now I can't remember its name. Can someone help? ...
Does anyone have any experience with the triangulated GPS used by the non-3G iPhone? How does it compare with 3G positioning? Does the iPhone 3G use triangulation in the event that there is no GPS signal available? Is there anyway to determine the accuracy of the non 3G coordinates? Thanks. ...
I'm researching Open Source GIS resources - and wonder out of all the Open Source tools that are out there - what people are actually using / finding useful. http://en.wikipedia.org/wiki/GIS_software ...
I'm using GPS units and mobile computers to track individual pedestrians' travels. I'd like to in real time "clean" the incoming GPS signal to improve its accuracy. Also, after the fact, not necessarily in real time, I would like to "lock" individuals' GPS fixes to positions along a road network. Have any techniques, resources, algorithm...
I have a bunch of files with coordinates in UTM form. For each coordinate I have easting, northing and zone. I need to convert this to LatLng for use with Google Map API to show the information in a map. I have found some online calculators that does this, but no actual code or libraries. http://trac.osgeo.org/proj4js/ is a projection l...
I'm developing an application with a feature that allows users to mark places on a map (events, locations etc.). I'm not allowed to use the basic google maps api because it requires pages that implement the maps to be publicly available. Does anyone know of any alternative with rich layers (including Europe, Asia, etc.) that can be used ...
Hi Everyone, I have a project to designing a website to search Zip codes on a digital map. Somebody advised me to use PHP with postgreSQL or MySQL. My professor wants me to tell him why I chose this for a mapping site. The question is... Is there an expertise web language for GIS site ?? What is the difference if I use MySQL or MSsql ...
If I have a point, and a road network, how do I find the nearest point ON the road? i.e. this is like snapping the point to a line/road. I am using ArcGis server 9.3 with Java 5 and Oracle 10g. I am using the ST functions and NetworkAnalyst via the java api. Thanks. ...
I've got a list of points, and a route that an external provider has generated through those points. I would like to generate a route using those same point with my own road network. Then I want to be able to detect if there is any significant difference between the two routes. One suggestion is that for the 2 routes, we find out w...
Suppose I have the following: A region defined by minimum and maximum latitude and longitude (commonly a 'lat-long rect', though it's not actually rectangular except in certain projections). A circle, defined by a center lat/long and a radius How can I determine: Whether the two shapes overlap? Whether the circle is entirely contai...
i'm building a client-side WMS parser (flex/ActionScript 3) & i'd like to test against as complex a WMS mapserver as i can find. can anyone point me to some sites? thanks. ...
I have a shapefile of India with states (probably as polygons). I want to convert each polygon into equally divided cells ("raster" way), and populate (actually coloring) each cell by a value that would be calculated from an algorithm which is cell's location specific. This should be done for all the cells in the polygon (programmaticall...