A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane
6
votes
1answer
76 views
Is there a name for map projections that produce two disks?
I've seen lots of world maps in the shape of two disks that touch, each one a separate projection of one hemisphere onto a disk -- usually the Western Hemisphere and the Eastern Hemisphere -- so ...
0
votes
1answer
108 views
How do I add a Corel Draw map as .dxf file to QGIS and how do I georeference it?
I have a vector data map of Poland, which I exported from Corel Draw. I can display the map in QGIS. At first the boundaries and subdivisions are only displayed as lines, after saving the data as ...
1
vote
0answers
80 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 ...
0
votes
1answer
147 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 ...
0
votes
0answers
98 views
How to re-project the EASE (Equal Area Scalable Earth) grid with a ~25 km cylindrical projection to WGS84 0.25 degree?
I have nc files ,here is one file https://echange-fichiers.inra.fr/get?k=LUfqiyO1Dl7az5bihnS. from the metadata ,the projection is cylindrical and the resolution is 25 km:
...
1
vote
1answer
65 views
Python error when running SpatiaLite with OSGB(27700)
I have a project open in QGIS and am trying to import an Ordnance Survey Address Point layer into SpatiaLite. I have recently installed the Qspatialite plugin. I open SpatiaLite in the DB Manager ...
4
votes
2answers
190 views
How do I Capture GDAL projection and create matching output (OGR or GDAL) shape files?
Working in C++, using GDAL and OGR: Depending on what the user has supplied for image input, I need to output point (or other) shape files in the same projection as the input raster images. The ...
6
votes
1answer
135 views
Coordinate system in aerial imagery
I am calculating WGS84 coordinates of points in an aerial image, given the WGS84 coordinates of the center of the image and the ground distance width and height (calculated from altitude and lens ...
9
votes
9answers
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
138 views
Why are the output point shapefile PRJ files empty?
I have tried evry thing I could find (using C++) to create a new .prj file for an output point shape file using OGR. While I get no compilation or execution errors and ArcMap accepts the file as a ...
2
votes
2answers
216 views
How to avoid exceeding latitude and longitude limits, when importing a .csv file?
I am currently working with a project with "on the fly"-projection (WGS 84 / UTM zone 32U).
Now I want to import a csv. file with points, which have a longitude and latitude using the "Add Delimited ...
2
votes
0answers
152 views
Mapserver+openlayers: displaying a shapefile with Cylindrical Equal Area (Lambert) projection
I have some shapefiles in "World Cylindrical Equal Area (Lambert) projection".
The .prj reads:
PROJCS["World_Cylindrical_Equal_Area",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_
...
3
votes
1answer
80 views
Projectionless shapefile with unknown source
I have a bunch of maps that are output from a land use model in .asc format, but none have a projection file associated. The person who originally ran the LU model is long gone, so I don't have access ...
1
vote
1answer
487 views
What is the default projection in Leaflet?
I've read an API documentation for Leaflet on its site, but I can't realize: what is a default projection to view maps? It was written about spherical and elliptical Mercator and Equirectangular - so ...
1
vote
2answers
319 views
Howto change OpenLayers BBOX request projection?
My map uses EPSG:900913 projection on the map.
All coördinates in the database are stored in the 'normal' google format / GPS coordinates (WGS84). For instance, if you save a new location..Before I ...
0
votes
1answer
111 views
Terrasolid - How to define spherical mercator (EPSG: 3857)
Im trying to define the srs EPSG 3857 inside Terrasolid sofware. I ran into a problem because the definition of the reference ellipsoid is given with a major axis and inverse flatening, not via both ...
6
votes
5answers
2k views
Better Distance Measurements in Web Mercator Projection
I am working with an ESRI stack, storing my layers in a sql-spatial-enabled-SDE- geodatabase (Geometry type, Web Mercator-3857).
I am building a web mapping application, so by default, the tiles are ...
1
vote
0answers
109 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 ...
3
votes
1answer
426 views
Openlayers and Geoserver fail to reproject while editing Vector with WFS-T
I can't get the Openlayers and Geoserver work with WFS-T editing a vector layer.
I have a layer of points where the Native SRS is EPSG:32639.
After trying a lot of combinations, I ended up with two ...
4
votes
1answer
266 views
use proj4 to specify Robinson projection with R ggmap and ggplot2 packages?
I want to project this map in robinson projection:
library(ggmap)
world <- map_data("world")
ggplot() + geom_path(data = world,
aes(long, lat, group = group))
...
7
votes
2answers
590 views
Bertin 1953 map projection settings
I am trying to use the Bertin 1953 map projection, as described in the book "Semiology of graphics" by Jacques Bertin. But I can't find the settings in any of my GIS software.
Does anybody have a ...
6
votes
2answers
230 views
What projection does the global climate region map from Wikipedia use?
I would like to use this global climate region map from Wikipedia as a "basemap" (by plotting over the image in R).
Is it possible to determine the projection of this map?
1
vote
1answer
886 views
How to Project shapefile from NAD 1983 UTM Zone 12 to WGS 1984 UTM Zone 13N?
I have a question and I have a shapefile that is in NAD UTM Zone 12 and Datum is North American Datum of 1983.
What I would liket to reprojection it to NAD 1983 UTM Zone 13N and change the Datum to ...
2
votes
1answer
299 views
How to re-project shapefiles?
I wanted to re-project a QGIS project, but there is no such option. When searching for an answer I see ogr2ogr suggested for this task, by re-projecting each vector layer (shapefile in this example). ...
2
votes
1answer
168 views
OpenLayers Vector Layer not aligned with Google Oblique Imagery
Check http://jsfiddle.net/vasile/BKvcX/6/
In the first map, the yellow line should follow the street curve, however if you pan the map up-down, you clearly see the misalignment due to what ?
...
4
votes
0answers
188 views
How can I improve my Georeferencing results?
Background This is my second question related to georeferencing naked raster maps in order to re-visualize them on different coordinate systems and in conjunction with other data layers. The previous ...
2
votes
1answer
135 views
Convert map to use space oblique mercator projection
I have a map document in ArcMAP which I want to convert to using Space oblique mercator projection, but not sure if ArcMap supports it. Any hints on how to achieve this?
thanks!
3
votes
1answer
136 views
High Resolution Sinusoidal Interrupted Projection of the Earth
My grandfather built a rather large globe 10 years ago and never got to complete it (he started drawing about a fifth of it by hand and just gave up after that).
I have been looking for a sinusoidal ...
1
vote
2answers
199 views
What is the SRS code for Lambert Conformal Conic projection and GCS Everest Definition 1962?
I have a shapefile with Geographic Coordinate System is "GCS_Everest Definition 1962" and the Projected Coordinate System is "Lambert_Conformal_Conic". I want to add this shapefile in Geoserver. But I ...
2
votes
1answer
89 views
Is there a difference between ESRI's NAD83 Indiana SPW and QGIS's?
It seems ESRI and QGIS don't have the same definition for my most commonly used projection, NAD83 StatePlane Indiana West (US ft). When I create data in an ESRI product the projection shows up in ...
5
votes
1answer
209 views
Determining Natural Origin for a GeoTIFF file (Lambert Conic)
I am trying to display an existing GeoTIFF file (from the FAA WAC set) in an application that requires the GeoTIFF NaturalOriginLongitude tag (FalconView 5.1.1). There are some older files in that set ...
1
vote
2answers
290 views
PRJ file for Stereo70 S-42 projection
I receive lots of Romanian maps with the projection STEREO70 with Datum "S-42 for ROMANIA". I have only found the "Stereo 1970.prj" by ESRI, and when I open the maps with my GIS software the ...
2
votes
0answers
83 views
projection discrepancy with gdal (1.9) and proj4
I boiled the problem down to that python example:
import sys
try:
from osgeo import gdal
from osgeo import osr
except:
import gdal
import osr
if __name__ == '__main__':
version_num = ...
2
votes
1answer
380 views
OpenLayers Map with custom SRS (without EPSG code) [closed]
Is it possible to show geodata by OpenLayers in custom projection?
I want to show my geodata in OpenLayers interface.
Source layer(s): shape-file(s), standard epsg:4326 lon/lat projection; ...
4
votes
2answers
369 views
How to convert NAD 27 to WebMercator in using the ESRI Silverlight API? (C#)
I am working with the ESRI Silverlight API. I found THIS post in the ESRI forums and THIS OTHER which show how to convert between WGS84 geographic coordinates and WebMercator coordinates. I want to do ...
3
votes
1answer
116 views
Problem in displaying a GeoTiff image in JMapFrame
I'm trying to display a GeoTiff image with no projection but where the geographical extent (bounding box) is known:
reader= format.getReader(new File(sImageName));
GridCoverage2D gridCoverage= ...
1
vote
1answer
106 views
Idaho's southern border looks curved in ArcMap. How do I make Idaho look flat?
I have a polygon of Idaho's borders in ArcMap. The southern border of the state is slightly curved. I realize that the Earth is curved in reality, but I want Idaho to look flat.
Is there a way to do ...
4
votes
2answers
95 views
GIS projection for non-geographic data
I am working on two different types of data. One is related to mapping of Genome structure and another is creating a layout of the inventories inside Internet Data Center.
What I am confused about is ...
18
votes
1answer
791 views
How to create an accurate Tissot Indicatrix?
A Tissot Indicatrix is useful method for communicating at a glance the kinds of distortion a given projection is prone to (in the figure below, each of the red circles occupies the same area). I've ...
2
votes
1answer
475 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: ...
4
votes
2answers
651 views
TileCache and Openlayers Problem - Projections?
I have a very known problem, but I can't solve it.
I have set the same maxExtents in the config as in the Openlayers init JS. I have done the same thing with the projection (EPSG:900913) and done all ...
2
votes
1answer
69 views
cannot reproject postgis in mapserver
I am trying to set up a wms server using point data in a postgis (v 1.5.1, pgsql v 8.4) database and mapserver (v 1.5.1) (I know these are not the most current versions of anything, but my server is ...
16
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 ...
3
votes
0answers
242 views
How to define Winkel Tripel in proj 4.8.0?
I have QGIS with proj 4.8.0 installed. I'd like to add Winkel Tripel projection which seems to be defined as
+proj=wintri
But that definition string does not work. Is this a bug in my proj version, ...
2
votes
0answers
79 views
Projection declaration in dojox.geo.openlayers possible?
I am trying to integrate some maps of my own into the dojox charting demo and I had success in exporting a shapefile (externally, i.e. with my own parser) to the dojo JSON map format. The map is in ...
1
vote
0answers
79 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 ...
7
votes
2answers
314 views
Is the quadrilateralized spherical cube map projection the same as Snyder's cubic equal area map projection?
Is the quadrilateralized spherical cube map projection [1] the same as Snyder's cubic equal area map projection [2]?
I know both are equal area polyhedral map projections ( ...
1
vote
0answers
98 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
2answers
160 views
projection issues from ArcGIS to Qgis
I am pretty new to ArcGIS and Qgis. I have loaded some geometry data in Qgis from my postgres database, then I have also loaded the same data in ArcGIS. Then from ArcGIS i have created a shapefile ...
