A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane
0
votes
0answers
6 views
MapServer Mapfile: Scalebar not displaying correct distances?
Scalebar:
SCALEBAR
LABEL
COLOR 0 0 0
SIZE SMALL
END
STYLE 0
SIZE 180 8
POSITION lc
COLOR 0 0 0
UNITS MILES
INTERVALS 2
TRANSPARENT TRUE
STATUS EMBED
END
I didn't even ...
1
vote
1answer
87 views
MMQGIS: How to make grid layer in meters not degrees?
I've read several of the posts on here pertaining to MMQGIS Create Grid Layer option, but I have not found information on how to make the grid based on meters veres degrees. I know how to manipulate ...
0
votes
0answers
27 views
Reprojecting GeoTIFFs to WGS84/UTM
I'm using libgeotiff and proj4 to read and (try to!) process GeoTIFFs. After reading the file, I want to get the corner coordinates in WGS84/UTM - but there are so many functions and parameters to try ...
15
votes
2answers
840 views
How does one calculate distortion on Equirectangular Projection?
I am trying to calculate distortion so I can distort overlaying text and forms to precisely match an image of an equirectangular projection.
So, how does one calculate the distortion at a given ...
0
votes
0answers
80 views
automatic data conversions from UTM zone 11 projection to NAD_1983_10TM projection [closed]
I have some CAD files and GPS data I need to store in ArcSDE database. These data are currently in UTM projection, our desire is to have them stored in the database as NAD_1983_10TM projection.
...
1
vote
2answers
61 views
Mapping elements in a warehouse
I am new to GIS. For a small project I want to map elements in a warehouse and want to find the location of the elements later (e.g. nails are located at x,y).
Now I am wondering what kind of ...
0
votes
2answers
59 views
Thiessen Polygons and Coordinate Projections [closed]
I am trying to perform a Thiessen Polygons analysis in ArcGIS 10.
My DEM is in GGRS_1987 and the point set I downloaded from Google Earth is in WGS_1984. The points display correctly but when I run ...
1
vote
1answer
52 views
OpenLayers TMS limit zoom and extent
I have a custom map which I get from a mbtiles file with the bounds -13,25,49,60 and zoom from 4 to 10.The display div is dynamic, I mean that it depends on window size and the extent restriction ...
2
votes
1answer
98 views
Find projection of a point to a line
I have a segment defined by 2 LatLon points(A and B) and a third LatLon point (C).
I need an alghorithm, formulae, or some code to find the projection point of C on the segment AB (call this point D) ...
0
votes
1answer
71 views
OpenLayers WMS - TypeError: this.resolutions is undefined
I'm trying to setup a map with WMS and WFS Layers by using Geoserver.
However, when I'm combining WFS and WMS (with some Google basemaps) together in one map I got following error in Firebug:
...
2
votes
1answer
55 views
Find projection from dataset
I have a dataset that I have pulled from a MaxSea 3d database.
I am trying to figure out what projection is used, so I can transform and use the data. I have tried following this guide ...
1
vote
2answers
61 views
OGR Projection transformation error
I am trying to convert shapefile that was created by FME in EPSG:900913 to EPSG:3857 (I know its the same definition) with OGR in a script.
datasource = ogr.Open(os.path.join(dirname,shapefileName))
...
0
votes
0answers
43 views
Changing projection does not change map extent
I have a shape file with a UTM projection. I want to save the data to a new shape file with a lat/long projection for a mapping system that only can deal with lat/long projections.
I open the UTM ...
0
votes
1answer
30 views
Using the projection of a layer variable to project another in Model Builder in ArcGIS
So in model builder I would like to have one input feature class projected to match the projection of another layer (a raster layer) that is a variable in the model. Can anyone help me achieve this?
1
vote
1answer
43 views
When is a projected length calculated via a pythagorean distance more accurate than an ellipsoidal length?
I'm using spatialite 3.0.1 with the following test data (in EPSG: 4326):
Name astext(geometry)
---------- --------------------
Belitsa POINT(23.563 41.947)
Malko Tarn POINT(27.533 ...
2
votes
1answer
36 views
Does the Load Data function in ArcCatalog automatically re-project the data?
If I have a feature class within a dataset in one coordinate system and using the Load Data function, load that data into a feature class of a different dataset that's in a different coordinate system ...
1
vote
1answer
41 views
Long range Trilateration from 3 lat, long, range
I've been looking at the following solution to a similar problem
Trilateration using 3 latitude and longitude points, and 3 distances
However with my problem the 3 points are spread over a large ...
0
votes
1answer
42 views
Wrong object size after projecting spatial data from one coordinate system to another
I am having problems reprojecting items in ArcMap 10.1 from British National Grid To WGS84. (WKID: 27700 Authority: EPSG to WKID: 102100 Authority: ESRI)
All Polygon Layers I project [I use Project ...
1
vote
1answer
38 views
Is it possible to have another CRS in the status bar than used for the map?
I am new to QGIS.
When I use OSM or Google Maps as a basemap via Open Layer Plugin, the map should be projected as EPSG: 900913. However, the Coordinates shown in the status bar are useless for me, ...
19
votes
9answers
1k views
Discontinuous or Interrupted map projections?
Do any of the current open source GIS softwares support discontinous projection systems? E.g. sinusoidal, dymaxion, butterfly, etc? If not, are there any affordable commercial ones that do (affordable ...
1
vote
1answer
48 views
How to understand GeoTIFF tags?
I'm trying to understand GeoTIFF info, but not getting far. For instance, using listgeo with one file I can get this output:
Geotiff_Information:
Version: 1
Key_Revision: 1.0
...
0
votes
1answer
81 views
Problem Overlaying layers in OpenLayers
I have a html page with 2 WMS layers.
The first is one Base Layer , & the second is my personal WMS feature. I load it from Geoserver. The problem when I add the 2 layers I do not have the ...
0
votes
0answers
31 views
ArcMap 10.1 Projection after KML to Layer
I am trying to add a polygon from a KML file to my ArcMap 10.1 project, which works fine with the "KML to Layer" Tool.
The problem I have is regarding to the projection that after converting from KML ...
1
vote
0answers
39 views
Trying to convert to EPSG:27700 (Ordnance Survey) projection, unable to do so
I'm trying to code an interface that allows a user to draw a vector shape on openstreetmap, which is then converted to a WKT string, processed by the server and sent of as a WFS query to emapsite ...
8
votes
2answers
236 views
how to produce a Peirce quincuncial map?
As far as I know neither PROJ4 nor ESRI tools can apply the Peirce quincuncial projection.
Does anybody know what libraries/softwares can manage it?
0
votes
1answer
58 views
Which CRS fits “Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20”?
I am trying to georeference a VFR chart in qgis and I can't figure out which CRS to use.
Map projection - Lambert Conformal Conic Projection, Standard Parallels 46.40 and 49.20.
Any ideas which ...
0
votes
0answers
21 views
How to retrieve PROJECTION value for a map?
I am trying to read the Projection from Geotiff/shape file, using gdal 1.9.0 by the following command in the command line...
gdalinfo.exe -proj4 map-path
but its retuning empty string for ...
1
vote
1answer
40 views
How do you make a function for changing projection with proj4js in Openlayers?
I have included Proj4js in OpenLayers. I would like to create a function (so I can use a make a button). To change the projection of my map.
I have included in javascript
Proj4js.defs["EPSG:54008"] ...
1
vote
0answers
255 views
Moving GPS Points with a VB script - Bearing works well but distance is wrong
I am using a script I found online created in 2003 by one of the commentators here. It is a great script and exactly what I have been looking for and I'm very glad to have found it. It simply takes ...
1
vote
2answers
44 views
Error reported when trying to import prj for data points in New Brunswick Canada into QGIS
I have data points recorded with a Trimble GIS. The projection is New Brunswick Sterographic Double Projection, which as near as I can find via a Google search is EPSG:2953. However, when I try to ...
1
vote
1answer
71 views
TileStache + OpenLayers TMS - Tiles are rendered disorderly
I newly turned to TileStache to render Mapnik tiles because of the caching option. Before, I was using Mapnik python bindings only and it was working perfectly. Now that I use TileStache, the tiles ...
1
vote
1answer
55 views
Python GDAL/OGR: WGS84 & meters units
I'm dealing with shapefiles projected in:
GEOGCS["GCS_WGS_1984",
DATUM["WGS_1984",
SPHEROID["WGS_84",6378137,298.257223563]],
PRIMEM["Greenwich",0],
...
9
votes
10answers
4k views
Batch convert lat longs to UTM?
I've got a .csv file that contains a long list of latitude and longitude points. Is there an efficient way to batch convert the list into a projected UTM coordinate system?
Thanks.
2
votes
2answers
63 views
How to reproject all featureclasses in a database to another database?
I am very new to arcpy and have ArcGIS 10.0
I would like to make a script where I would only have to change two variables in a script (database_input and database_output) so that I can reproject all ...
1
vote
0answers
129 views
How to overlay 3 different layers using ArcMap
I have to overlay 3 different layers called "Bacino Isonzo Perimetro", "Bacini Tributari Isonzo", and "Isonzo" in ArcMap. Layers'properties are shown below.
BACINO ISONZO PERIMETRO
Data Type: File ...
0
votes
1answer
56 views
Python GDAL: degrees to meters without reprojecting
I am trying to get senseful results in my Python script. I want to measure distance between features in a shapefile. I'm working with the SRS: GCS_WGS_1984, so my units are in degrees. But for the ...
1
vote
0answers
95 views
ArcPy 10.1 PointGeometry.projectAs()
I'm trying to reproject an X,Y passed in from an Add-in.
So far this works fine:
pointGeometry = arcpy.PointGeometry(arcpy.Point(x,y),srIn,False, False)
projectedPoint = ...
1
vote
1answer
39 views
How to I create a .prj file with the following projection parameters?
I have received shape files that are missing .prj files. The documentation for the shape files describes the projection system as Lambert Conformal Conic and provides the following "Projection ...
0
votes
1answer
47 views
How can I clean up this OpenLayers code by correctly doing a transform or projection, for an array of features?
I have some features I've created via some Kml data.
Now, to display these features on a Google Map, I need to project them from 'EPSG:4326' to 'EPSG:3857'. This works great.
Now, i need to convert ...
0
votes
2answers
78 views
How do I reproject one raster to match another's in GRASS
I have two raster layers, A and B, which have information about the same location but have different projections and datums.
How can I reproject layer A to match the projection and datum of layer B?
...
0
votes
1answer
81 views
GMT raster (*.tiff + *.pgw) in epsg4326 shifts few kms (4326-900913-3857 problem?) [duplicate]
This seems to be an old problem with an already known solution (ie. "...stop using 900913 and start using 3857..."), but not sure whether this problem is about software versions, the raster itself or ...
1
vote
1answer
81 views
How to transform World data from EPSG 4326 to EPSG 3857
I have tryed different opensource tools to transform a world data shapefile from 4326 to 3857 but I always have an error. Im not sure, but is it because of Antartica?
I have tryed with GDAL and QGIS ...
0
votes
2answers
36 views
How to scale/reduce my polygon without changing the central lat & long?
I am writing a VBA code to resize my polygon, I get a input as vector points(Shape file). The code below resizes it as according to my scale factor but my central latitude and longitude are also ...
1
vote
1answer
52 views
Pseudo Mercator error?
I'm mapping on QGIS, I have a vector layer and his CRS is on EPSG:4326 - WGS 84, but also I wanted to put a satellite image, so when I do it, the image use WGS 84 / Pseudo Mercator.
The problem is, ...
0
votes
1answer
95 views
Why do ArcGIS Area Calculations not match Official Statistics?
I am trying to calculate area of polygons using a shapefile from the world bank where countries are defined.
When however I am trying to calcuate the area, the numbers that emerge are different from ...
0
votes
0answers
46 views
How to find out what projection my data is using?
I have a set of data that I created from gps locations of images. The locations are in decimal. I don't know what projection was used when the data was captured.
I used QGIS to display the data with a ...
0
votes
0answers
31 views
need info on GeoTIFF projection keys
I am a programmer (not a cartographer!!) developing an application which needs to read and write GeoTIFF files. I have a number of questions about those GeoTIFF keys which are related to projections.
...
1
vote
1answer
24 views
Editor and projections ArcGIS
When opening an edit session Arc is telling me that some of my shape files' coordinate systems do not match the data frame.
Here is the data frame coordinate system:
Stereo_70
Projection: ...
0
votes
4answers
163 views
Coordinates conversion doubt
In QGIS do I have a EPSG:4326 shapefile that shows the coordinates "-7148300 -3688500" and I need them in the format -64º -31º for further processing in a geodjango app.
However using ogrinfo I get ...
92
votes
9answers
17k views
What's the difference between a projection and a datum?
What's the difference between a projection and a datum?
