A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.
3
votes
0answers
304 views
How to detect MGRS/UTM zone?
I posted a similar question on StackOverflow, but I thought I'd check here as well.
I am developing an open-source library for converting between coordinate systems, and I've run into a wall.
I want ...
0
votes
0answers
237 views
Geoserver WMS cascading: How to choose remote CRS? [closed]
I'm cascading a remote WMS from Geoserver in order to have all layers in one place (and to exploit caching). (see the manual)
The remote layers (on this geoportal) are provided in multiple SRs (e.g. ...
7
votes
2answers
98 views
Which SRS to use for global distance queries?
I have a database with a lot of points in WGS84.
Now I am building an cache that performs NN and points in range queries using a KDtree. The point [sic] is that the search radius will be provided in ...
2
votes
2answers
171 views
Problems aligning layers digitized from Google earth into ArcMaps10
I'm a PhD student new to ArcGIS.
I'm digitizing features from Google Earth to use in ArcGIS (I work in India, where the mapping in GIS is at best scanty). I drew along a river in Google Earth, saved ...
0
votes
0answers
64 views
How do I determine programmatically what values to add to the proj4js constructor for a CRS or SRS such that I can iteratively render proper overlays
I think this is primarily a GIS based question as far as for example:
var crs = L.CRS.proj4js('EPSG:2154',
'+proj=lcc +lat_1=49 +lat_2=44 +lat_0=46.5 +lon_0=3 +x_0=700000 ...
2
votes
2answers
101 views
Coordinate system of a raster file to be introduced for transformation
I am working on raster data using GDAL. When I extract coordinate system information of the files I got this:
PROJCS["Geostationary_Satellite",
GEOGCS["GCS_Unknown datum based upon the custom ...
2
votes
1answer
470 views
Convert shapefile in NAD27 from meters to decimal degrees to match xy data?
I have a shapefile of a boundary (polygon) that has the following projection:
NAD_1927_UTM_Zone_11N
Projection: Transverse_Mercator
False_Easting: 500000.00000000
False_Northing: ...
15
votes
6answers
9k views
How can I define projections for multiple shape files in ArcMap 10 at once?
I have over 100 shape files that don't have .prj file and thus when I bring them into ArcMap they show the coordinate system as unknown. I know all of the shape files coordinate system is GCS WGS ...
1
vote
0answers
97 views
Adding X,Y data and viewing with existing shape file
Excuse me for a simple question. I have CSV files of X,Y data (in decimal degrees) that I want to add to a map and view with a shapefile of level III ecoregions that I downloaded from the USGS ...
1
vote
2answers
215 views
How to calculate the surface using Lambert correction?
i'm using lambert conformal conic , so we have distortions along any given parallel , i would like to get the area used to solve this distortion.
I have calculated the area using Shoelace formula , ...
2
votes
1answer
403 views
How to add points in degrees + decimal minutes to QGIS?
I try to add geocaches with x,y coordinates in a xls-table to qgis and convert to shp.file.
Usally geocach-coordinates are like this: N 51° 29.440' E 011° 56.430' (WGS84) (in german its called ...
2
votes
2answers
587 views
Convert RT90 into WGS84
Goal:
Gain WGS84 decimal to locate some cities in Google Map.
Problem:
I don't know how to convert the value of the RT90 coordinate system into WGS84 in SQL Server.
2
votes
1answer
243 views
How to create aux.xml file?
after starting to use MOBAC to create offline background maps I found the aux.xml files very useful as QGIS automatically sets the CRS so this would be very useful for my colleagues with smaller GIS ...
1
vote
0answers
66 views
Problems with CRS in Qgis [duplicate]
Possible Duplicate:
Raster incorrectly reprojected to OSGB(27700)
The crs is clearly off when the gridlines run straight and the map lines run at an angle.
I have set the crs to match the ...
1
vote
1answer
72 views
keeping the coordinate system of raster files in the resulting raster file after operation with numpy
I'm trying to read as array two raster files using ReadAsArray in GDAL/python, perform some map algebra operation on it using numpy and then write the resulting raster file in GTiff format using ...
2
votes
1answer
196 views
Coordinate system of a MODIS file to be introduced in GDAL for transformation
I am working on MODIS data using GDAL. When I extract coordinate system information of the files I got this:
Coordinate System is:
PROJCS["unnamed",
GEOGCS["Unknown datum based upon the custom ...
4
votes
3answers
3k views
ArcGIS coordinate system
I'm developing some software using ArcGIS API, but the question is rather theoretical, as I just came from Google Maps and have no idea where to start; everything seems to be different including the ...
2
votes
1answer
66 views
Latitude and Longitudes are replaced with zeros when importing excel 2007 worksheet into personal geodatabase
I am trying to import an Excel 2007 data set into a personal geodatabase so I can convert coordinate systems. The data set includes point locations in Decimal Degrees. When I import the Excel ...
3
votes
1answer
131 views
extracting pixel value from a table in postgresql
I have a table in postgresql that contains ID, row number, column number, pixel value and centroid of the pixel in WGS84 lat-lon system(4326). How could I extract the pixel value by giving a point in ...
1
vote
1answer
109 views
Taking a 'custom' map and transforming its x/y co-ordinates to 'real' long/lat co-ordinates?
I was wondering if someone could help me out with a little project I'm working on. I'll try to describe what I'm trying to achieve - if it doesn't make sense, please let me know.
I have in front of ...
2
votes
1answer
123 views
What coordinate system is this?
I just found a dataset of trees in San Francisco, but I'm unable to determine the system used for the coordinates. Here are some samples:
5998894.045593,2119007.035323
...
3
votes
1answer
162 views
Cannot select a feature using ArcObjects because coordinate systems differ
I'm using ArcMap 10 and Bing Maps Road as base map. Then we have our adding which is programmed using C#. What I'm trying to do is to select a feature (A) that intersects another feature (B, from a ...
2
votes
1answer
81 views
Library design: Layer coodinates/origin
I am working on a vector map library where you can add plain image and vector layers to a map. The map itself consists of an infinite coordinate system and each layer is a coordinate system of it's ...
2
votes
0answers
135 views
Coordinate systems conversion
I have the following task.
This is my sample data.
WGS84 datum (longitude/latitude):
-123.75 36.59788913307022
-118.125 40.97989806962013
Spherical Mercator (meters):
-13775786.985667605 ...
1
vote
0answers
59 views
Coordinate system for map downloaded Digimap?
I have download a 1: 25000 map from Digimap. It came as a tif file along with a tfw file. When I try to import the tif file as a raster layer, I get the following message: 'this layer appears to have ...
2
votes
1answer
157 views
How to programmatically determine whether a spatial reference factory code is valid?
I am using the following code segment to create a spatial reference.
spatialReferance = arcpy.SpatialReference()
spatialReferance.factoryCode = spatialReferanceFactoryCode
...
1
vote
3answers
205 views
How can I translate a GML definition of SRS to a usual format (e.g. WKT or PROJ.4)?
From GDAL 1.9.0 a new utility is available: gdalsrsinfo.
Although it can yield an XML (GML-based) definition from a source equivalent format or file, it seems that it can only read usual GDAL/OGR ...
0
votes
0answers
62 views
Coordinates move in sql server insert
When I insert a row in TableA in sql server I use this for the geometry column:
geometry::STPolyFromText('POLYGON((x1,y1,x2,y2,x3,y3,x4,y4,x1,y1))', 3007)
You can find the definition for ...
0
votes
1answer
97 views
If the Earth was flat, what unit of measurement would distances between geographic points be represented as?
A whole lot of abstraction- given two longitude/latitude points given from a GPS, I'm using the Pythagorean distance formula to find the distance between them. What unit of length would the distance ...
0
votes
0answers
91 views
In Geoserver, Using as a Data Store the Web Feature Server option, but I have a serious problem
I’m using as a Data Store the Web Feature Server option, but I have a serious problem, because Geoserver needs to know what Coordinate Reference System of my data. This information is used for ...
3
votes
1answer
315 views
QGIS custom CRS for map of manufacturing shop floor
I'm working on a web app that shows a map of a manufacturing plant's shop floor. I've built it in Inkscape and QGIS, but when I try to load it into Tilemill, I get a CRS error. Specifically, it ...
5
votes
2answers
409 views
Identify the latitudinal and longitudinal point directly beneath an object in space
Given the azimuth and altitude / latitude and longitude from the observer to the satellite, how can I accurately find the latitude and longitude of the point of intersection directly under the ...
1
vote
1answer
161 views
ogr: how to use epsg database for RD New projection?
I'm trying to assign this EPSG projection to my newly created shapefiles using ogr.
The OGR Projections Tutorial says:
...any geographic coordinate system in the EPSG database can be set by it's ...
3
votes
4answers
189 views
How to measure without coordinates?
My current Project is to "map" a turntable in qgis. I know, very unlikely but that's what my teacher wants.
My teacher also wants me to measure something in this project (Very specific, isn't it?). ...
15
votes
5answers
2k views
How do you best deal with data that spreads across UTM Zones?
I have data that spreads across two UTM Zones GDA/MGA94 UTM Zone 55 and 56. I have layers such as a cadastre, roads, pipelines etc where I want to store measurements like lengths and areas in metres ...
1
vote
1answer
319 views
UTM coordinate conversion to Geographic coordinates
I have about 500 separate files containing GPS points in UTM coordinates from multiple zones.
I am looking for a simple and fast python or Php script that i can use to carry out a batch conversion ...
1
vote
2answers
689 views
shape file coordinate system
I added a shape file of Iran to Qgis.
'Tehran' has 35.6833° N, 51.4167° E coordiantes, however Qgis shows Tehran with 4772860,31296767.
How i can view coordinates of a city or location in latitude ...
2
votes
2answers
377 views
How to use the coordinate system in arcgis 10?
I have a favor to ask. I have a few layers. The layers have been made by a different company. So how do I combine them all together so that they have the same coordinate systems? If there are any ...
4
votes
1answer
297 views
How to define a CRS using a projection rotated about a given point
I have a data set that uses a common projection, but has its own false easting and northing, and is rotated 315 degrees. I need to be able to work in this CRS and easily translate from one CRS to ...
3
votes
1answer
253 views
Different coordinate system for map project and scalebar?
Is it possible to specify a coordinate reference system (CRS) for the scalebar that is different to the project CRS?
Example: my project CRS uses geographic coordinates (lat/long), the reason being ...
1
vote
3answers
628 views
Local Coordinate to Geocentric
The ultimate question, I need a transformation matrix to take a point in local space representing a roughly 500m x 500m place in New Mexico centered at -108.619987456 long 36.234600064 lat. The final ...
2
votes
1answer
471 views
Why is my .prj file not being read by QGIS?
First off, I am new to GIS.
I am using qgis (1.8.0), and have been given a shapefile containing .shp, .prj, .shx, .dbf, however qgis will not load the .prj file stating an invalid data source.
...
2
votes
3answers
839 views
Problem with spatial reference system / shapefile projection
I am new to using QGIS and having some problems getting some shapefiles to project correctly. I am using publicly available shapefiles for New York City municipal boundaries found here:
...
0
votes
1answer
96 views
How do I reproject a arbitrary coordinate system grid to OSGB
I have a polygon grid of a certain shape that has some data associated with it. Unfortunately its not properly projected, being in what seems to be an arbitrary scale and coordinate system (it was ...
0
votes
4answers
766 views
How to plot a point on a static Google map [png]?
map&markers=color:blue%7Clabel:S%7C40.702147,-74.015794&markers=color:green%7Clabel:G%7C40.711614,-74.012318&markers=color:red%7Ccolor:red%7Clabel:C%7C40.718217,-73.998284&sensor=false
...
2
votes
2answers
150 views
Ordnance Survey osgb:BNG spatial reference system not recognized by PostGIS
I'm trying to load an Ordnance Survey GML file into PostGIS using the ST_GeomFromGML function. The problem is that the spatial reference system that is used in the file, osgb:BNG, is not recognized by ...
2
votes
0answers
225 views
PostGIS: ST_Transform function conversion problem
I'm inserting map data from a GML file with srid EPSG:27700 into a PostGIS database table with srid EPSG:4326. I'm using the ST_Transform function as in this snippet:
...
1
vote
0answers
23 views
Translate geographical coordinate [duplicate]
Possible Duplicate:
Calculating Lat/Lng X miles from point
I would like to know how could I translate a geographical coordinate to an specific distance. So for example let's suppose I'm ...
0
votes
0answers
15 views
QGIS 2 shape 2 different projections [duplicate]
Possible Duplicate:
Why don't different layers overlap in Quantum GIS?
I have a problem with 2 shape coming from different sources.
They represents differents items of Italy (roads and ...
1
vote
1answer
661 views
GeoToolKit conversion from lat/long to UTM
What is the proper way to convert lat/longs to a UTM coordinate system using the Java geotoolkit API? I have not worked with GIS software before, so maybe what I am trying to do is not directly ...
