A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane
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1answer
85 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 ...
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0answers
49 views
Projection for Tracking a Vehicle
I'm looking for the best coordinate system projection to use for cartesian calculations while a vehicle is running from its starting location to about 100 miles from that spot.
The offline format ...
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0answers
82 views
Lines as Great circles on a map
How can I get line features to appear as great circles on a map, instead of straight lines?
Thanks,
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0answers
57 views
What is a radar projection?
Trying to overlay a radar image(radar projection) on a mercator projected map, but have no idea about what a radar projection is.
So here are my quesions:
What is a radar projection?
What's its ...
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0answers
113 views
What is UTM Zone 0?
I am currently working with some roadway link data and it is being projected in UTM.
After importing the shapefile into GRASS I can view the map and it looks correct but when I view the projection ...
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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 = ...
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2answers
140 views
Why is Format of output data grayed out on Save As dialog for Rectify?
I started georeferencing and I could not save my new "rectify" file, I don't know if is because of the raster or I did something wrong. Then I find out that my control layer is not accurate, it ...
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0answers
86 views
Converting altitude in feet to pixels on a mercator map image
I know the question might seem farfetched given that the map is 2d. But I essentially want to project items-aircraft-above the map and I would like their altitude to be vaguely 'realistic' in terms of ...
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0answers
128 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 ...
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0answers
83 views
adding WMS service to application ArcGIS JS api
I've got map in projection: 4326 (WGS-84) when I try to add WMS layers which is in different projection I always get connection timeout Do you know if I could change WMS projection to set it up ...
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0answers
104 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 ...
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0answers
66 views
OpenLayers doesn't understand Mercator map measured in degrees?
I have access to a map server that takes a bounding box measured in degrees, and returns a map, projected in Web Mercator. I'm having trouble configuring OpenLayers to use a Mercator projection that ...
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0answers
96 views
Project tiles from custom imagery in transverse mercator with OpenLayers
I have the following parameters of a custom imagery and I need to set-up a layer in OpenLayers with which I would project the tiles properly from this imagery.
TransverseMercator
ellipsoidName=WGS84
...
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0answers
178 views
Get tile URL with projection different than 900913
I have the following code, which should display a slippy map showing tiles producted by me with mapnik:
Proj4js.defs["EPSG:31258"] = "+proj=tmerc +lat_0=0 +lon_0=13.33333333333333 +k=1 +x_0=450000 ...
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0answers
132 views
ScaleLine shows NaN for LCC projection
I have used openlayers along with geoserver. My Map is having LCC projection by default, but SRS is EPSG:4042.
The problem is that the scaleline shows NaN in meter as well as feet. How can I correct ...
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0answers
184 views
Imported netcdf file doesn't project correctly - help!
I have 360 netcdf files (.nc) that I need to import into ArcGIS. They hold monthly historical climate data in the U.S. When I tried to import one, using the Make NETCDF Raster Layer tool, the ...
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0answers
424 views
How to project geographic coordinates (lat/long) to a cartesian system (albers equal-area)?
I am using this matlab package http://www2.ocgy.ubc.ca/~rich/map.html#examples to project the latitudes,longitudes of my data to a specific projection.
For this particular case I am using albers ...
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0answers
97 views
How to compute a map-to-screen transformation?
Every projection calculation I have come across dealing with the Lambert Conic projection
converts the given Lat & Long to meters.
So now the magical question: how on earth do you take the meters ...
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0answers
192 views
A WMS layer fails to show at some scales
I am tring to overlay my WMS layer on Google but at a particular scale it doesn't show the data of my layer. What can be the problem?
<html xmlns="http://www.w3.org/1999/xhtml">
<head ...
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0answers
139 views
On the usage of Proj4Js->tmerc.js
I am using "proj4js & open layers" for my mapping.
I got projection & datum (which is based on "Transverse Mercator") of a local plane and
this plane is part of a grid which returns ...
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0answers
241 views
Conversion From Transverse Mercator To Longitude & Lattitude
I have to transform (7-parameters datum transformation) coordinates from northings & eastings to lattitude & longitude.
Following are details of source coordinate system(i.e. northings & ...
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0answers
208 views
How do I use Proj4js or other technique to make custom map projections with google.maps.Projection?
I'm using Google's Projection class to try to convert my map projection from the default spherical mercator to something like Lambert Conformal Conic. I was previously adapting the code from this ...
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0answers
113 views
How to show an array of 2d points/polygons in Polymaps (Cartesian coordinate system)
I need to display these 2d points/polygons (Cartesian coordinate system) on Polymaps with GeoJson layer.
I do not use the other layers.
Do I need to convert xy coordinates to the lat lon? If so, how?
...
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0answers
251 views
Geoserver tiles mismatch
I tried to get WMS tiles from geoserver like
/geoserver/gwc/service/tms/1.0.0/layername@EPSG%3A4326@png/15/19142/9530.png
or with another projection
...
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0answers
127 views
I am getting a blank layer preview from geoserver after Quick Exporting my shapefile to postgis and then getting postgis to point to geoserver
What could be the potential problems? Looking at the layer's data fields/form the one thing that isn't filled is the Native SRS and its source, but I have already passed in the projection info as it ...
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1answer
178 views
Defining multiple projections inside a file gdb [error 000289 failed to alter spatial reference]
I am importing multiple shapefiles into a filegdb in ArcGIS 10, and using the following code to define the projection of the feature once imported, to the .prj of the original .shp file.
Here is my ...
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0answers
337 views
mixing lon/lat and mercator layers in a MapServer .map file
I have a basic question about my MapServer .map file, which has two layers, each with a different coordinate system, longlat vs. mercator.
See my .map file below. If I leave it as shown below, with ...
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0answers
81 views
List of methods of determining the projection of a shapefile when .prj is missing [duplicate]
Possible Duplicate:
Best practices for identifying the unknown coordinate system of a Shapefile
It would be helpful to mention what information is needed to perform each technique. What are ...
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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 ...
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2answers
550 views
How would I convert this point to WKID 4326?
This is a point in Brewster, MA, USA. How would it be converted to WKID 4326?
324299.3348436486, 832511.5939650714
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3answers
689 views
Distort image to Mercator Projection view
i have an image that rendered from data i have on my DB. i need to convert this image, with Mercator Projection method, to distorted image that when i'll wrap a 3d sphere with it it'll looks ...
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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 ...
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2answers
883 views
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1answer
45 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 ...
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2answers
206 views
Shp's will NOT line up (coordsys) - shps made using GPSeismic sotftware (client made shp's)
OK, I asked this previously but solved it on my own last time. Same project, but differant shp files.
I recieved from a client shp files that were made in GPSeismic 2011. Upon recieving the shp ...
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1answer
160 views
Which area measurement to trust? - The same polygon in GoogleEarth v. ArcGIS [duplicate]
Possible Duplicate:
What is the most accurate coordinate system for calculating areas of polygons?
I'm currently involved in comparing the "official metropolitan" areas of several cities ...
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1answer
245 views
lonlat from geometry point gives strange result
I added a vector layer to my main map with the controls like the example from openlayers: http://openlayers.org/dev/examples/draw-feature.html
Now when I want to get the resulting lonlat from the ...
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1answer
499 views
I can project from UTM (zone 10) into State Plane (Oregon), but I can't do the reverse — why not?
I have an air photo with the following xy coordinate system name:
NAD_1983_StatePlane_Oregon_North_FIPS_3601_Feet_Intl
and the following in the description field:
Projection:
...
0
votes
1answer
57 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
1answer
53 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 ...
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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 ...
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2answers
98 views
Tile script (Mapnik) with OpenLayers - Problem with projection (900913)
I use Mapnik python bindings in a geodjango application to render tiles in openlayers with datasource stored in postGIS in 900913 projection. The feature seems to be rendered correctly in the ...
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votes
3answers
401 views
How can I get the proj4 string or EPSG code from a shapefile .prj file?
I have to work with a shapefile defined in an unusual projection, which my GIS software does not know about. How can I get the proj4 definition or the EPSG code for the projection?
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1answer
77 views
How to get DXF to show up in the right spot?
I just followed the advice of this forum post in order to export the vector layers of a PDF for usage in ArcMap. The map vector layers in the PDF were spatially referenced. I was able to export the ...
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votes
1answer
74 views
How can I find and fix broken raster metadata using QGIS?
I have a raster (TIFF) hillshade image that I would like to use in a mapping project. However, I'm having a hard time lining it up properly in QGIS. Through a series of investigations, I have ...
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1answer
127 views
Setting projection to a geotiff file when it's shown as Unknown
I have a geotiff file that has no CRS in the metadata but I know that the CRS of the raster is WGS 84 UTM 22 N.
How can I modify the geotiff file to have the CRS WGS 84 UTM 22 N in the metadata.
...
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1answer
327 views
Reprojecting non 4326 WMS image to spherical mercator
In OpenLayers, I'm trying to display a WMS overlay (EPSG:4269) from a server I don't have control over to a spherical mercator projection.
Is there an equivalent to this:
...
0
votes
2answers
2k views
How to create custom coordinate system in ArcGIS?
I have a series of control points with xy coordinates in both NAD83 UTM and in a local grid.
How can I go about creating a new projection file in ArcGIS 10 for the local grid?
Thanks
0
votes
1answer
271 views
How to point out a city from a map image of world with longitude and latitude?
have a map image 800px wide. How can I figure out a city.
like New York has 40.75 latitude and -73.98 longitude. I have to pin a mark over this point.
Before I have done with x_axis and y_axis which ...
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1answer
203 views
How to realign misplaced GeoTiffs?
I have bought a few (30) GeoTiff maps from my country's Geo-department - South Africa. They all have a date in the filename and the newest one was created in 2004, I see one is dated 1977 - that old! ...
