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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3
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2answers
136 views

Calculate distance in QGIS, wrong geographic projection?

I'm trying to do the following: I have 2 shapefiles, one containing all the public schools in NY, another one containing the hotspots in NY (both in points form). Now what I'm trying to do is ...
2
votes
0answers
77 views

How can I improve the resolution of a vector grid made in north pole stereographic projection?

I've been struggling with this for a while and wondered if someone could lend a hand. I have a map which already has sampling points from centroids in a 35x35km grid that was created in north pole ...
3
votes
1answer
180 views

Coordinate systems and bearings

Ok so I've got a noodle scratcher and want some input before I open my mouth to my higher-ups. I recieved a new boundary description from a surveyor that uses metes and bounds in the form of bearings ...
1
vote
1answer
96 views

Heads up digitizing - Polygons overlay differently with two different Satellite images

I have been digitizing building footprints from satellite image using ArcGIS 10.1 . Field data collections is done with the use of four corner point GPS way point. Due to multipath errors, we are ...
0
votes
1answer
156 views

OpenLayers overview shows wrong map

i have a problem. I have to implement a map with OpenLayers. As BaseLayer I use an external WMTS-Service, which has the projection EPSG:25832. I want to have an OverviewMap, but the OverviewMap ...
2
votes
1answer
138 views

Change coordinate system of a WMS service

I have a WMS service that is projected to UTM/SAD-69. My workspace is in WGS-84 with no projection. I want to change the coordinate system of my WMS service. Is it possible in ArcMap 10.0? The wms ...
2
votes
1answer
61 views

Misaligned GADM shapefiles and the NE dataset

I am very new to using GIS programs, so please excuse me if this is a trivial question. I'm having the following problem: When adding a GADM shapefile layer for Uganda onto the Natural Earth set of ...
5
votes
2answers
495 views

Stereographic projection of WGS84 ellipsoid on a plane[python]

I would like to ask you for help in following task. What I need to do is to derive local x,y coordinates from latitude, longitude, applying stereographic projection of WGS84 ellipsoid on a plane, ...
0
votes
1answer
98 views

Different output from running algorithm in toolbox and from script

I am unable to get the same results when running the qgis:reproject tool from QGIS processing toolbox (QGIS version 2.0.1) as when running it from a Python script (console). In this example I am ...
7
votes
1answer
80 views

Best practices and examples of web maps of polar regions

I am looking for examples of web maps focusing on polar regions (Arctic or Antarctic) preferably using a polar projection. What could be best practices to follow for such web mapping applications? Any ...
1
vote
2answers
156 views

No prj file output from qgis:reproject

I'm trying to reproject a vector layer using the 'qgis:reproject' algorithm in the processing/sextante module of QGIS, from Python. This kind of works, but the .prj and .qpj files created after ...
2
votes
1answer
158 views

Waterman Projection in ArcMap

Anyone have any idea how to create (or where to find) the Waterman "Butterfly" projection in ArcMap?
1
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0answers
24 views

Implementing day night functionality [duplicate]

I want to implement day/night functionality on world map i.e there will be dark layer showing countires having night now. This world map could be creaeted through ESRI or SVG map.I want to ...
2
votes
1answer
87 views

Reprojecting Natural Earth dataset to World Eckert I

My question is connected with QGIS 2. Could anybody explain me how I ought to reproject the Natural Earth dataset there in order my world map to look correctly? When I strive to reproject these data I ...
3
votes
1answer
142 views

QGIS display does not reflect projection

I have slight experience with ArcGIS, but am new to QGIS. I'm trying to set the projection of my map, and I understand that this is done by altering the CRS (coordinate reference system) of each ...
2
votes
2answers
925 views

How to locate a point on google maps/earth using cadastral maps in Kenya

I'm an architect, so not too well versed with all this datum/transformation talk. My little problem: i want to be able to enter a position using UTM or deg/sec/min coordinates into google earth and ...
3
votes
2answers
974 views

How to transform data points from WGS84 to NAD27?

Preface: I have a set of lat and long data points from Google Maps, which I believe are in WGS84. My project data is in NAD27(BLM14). These points are in West Texas, where NAD27 differs from WGS84 by ...
3
votes
0answers
324 views

Fortifying re-projected shapefile for ggplot2 in R

I have a shapefile of US county boundaries which I got from the NHGIS. I can load the file using the rgdal package and see information about it: library(rgdal) shp_1860 <- readOGR("shp", ...
0
votes
2answers
61 views

Projecting OpenStreetMap raster base in other projections

I know that OSM WMS service works with EPSG:4326 and EPSG:900913 I need to have an OSM base layer projected in another Projection, for example EPSG:32632 Do you know some way to do this? Even ...
2
votes
3answers
202 views

What is the projection of an Android Location class instance?

What is the projection of a Location object returned from the LocationClient by a class implementing the LocationListener interface with a fused provider in the Google Play Services SDK? For example, ...
1
vote
1answer
266 views

OpenLayers using GoogleMaps layers: issues with setCenter and transform

Past week or so I have been doing everything in just OpenLayers and has been going great: been using markers, vectors, bringing in json data via php, and some ajax. Everything has been in one layer ...
0
votes
0answers
306 views

openlayersplugin qgis 2.0.1

I have installed qgis 2.0.1, great thing... but.. open layerplugin doesn´t work proper. When I try to load two different open layers I get the answer "could not draw google satellite because:" Also ...
2
votes
0answers
37 views

Layers with the same Geographic Coordinate system don't overlap [duplicate]

I am a GIS newbie. I'm having a problem that, from the looks of things on this website, is a fairly common problem. I have 3 layers, all in the same GCS that do not line up. I have read all the the ...
2
votes
1answer
48 views

Change the projection at runtime (OpenLayers)

How do I change the projection on an existing Map object? I'd like to allow a user to switch between cylindrical (EPSG:4326) and custom-declared projections with the click of a button.
1
vote
1answer
59 views

cannot get EPSG of bounding box

I use openlayers 2.12. I created a form where the user can insert a bounding box, to insert to the database a new borough. To check the EPSG of the borough I tried the following //ba bb bc bd came ...
3
votes
1answer
106 views

Problem with projection in layer

I'm having problems with visualizing a layer which is in EPSG:4326 Apparently the geometry looks perfect, but I don't know why, it's not in real coordinates. I have projected it to 4326 with QGIS, ...
2
votes
2answers
444 views

Spherical Mercator projection invented by Google and not conformal?

I had some certitudes on the Google Spherical Mercator also known under EPSG code 900913 and 3857 before looking at this presentation, I was sure that this projection was in the Mercator family (so ...
0
votes
1answer
398 views

r openproj to plot in open street map in a different projection

I am very new to geographic data, so I am sorry for the stupidity of the question. I need to plot some data that are in this projection EUREF_FIN_TM35FIN Projection: Transverse_Mercator ...
0
votes
2answers
121 views

Appropriate map projection for the UK?

As the title: what is the most appropriate projection to reduce distortion, if I'm just showing the UK on a map? Is WGS84 fine (since it's a relatively small area), or should I use some other kind ...
1
vote
1answer
92 views

How to reproject EPSG:102218 with QGIS?

I have a raster file. ArcMap says it is in NAD_1983_USFS_R6_Albers (EPSG:102218). QGIS says it is in USER:100000 - * Generated CRS (+proj=aea +lat_1=43 +lat_2=48 +lat_0=34 +lon_0=-120 +x_0=600000 ...
2
votes
0answers
20 views

Draw cirlcle on Equirectangular projection [duplicate]

I'm trying to draw a circle (actually a great circle) on an equirectangular map to archive something like this http://i.stack.imgur.com/7EliU.png (from here). So I have the lat/lon coordinates of the ...
5
votes
1answer
141 views

Good projection for covering most of the world

I'm writing an application for building navigation routes thru the city streets, and not quite sure what projection would be best. I tried EPSG:3587, however, the tools I'm using - GeoTools and ...
1
vote
1answer
71 views

What should this projection be in OpenLayers?

This is esri rest prj, "spatialReference": {"wkt": ...
0
votes
0answers
125 views

why readOGR() is not reading projection information from .spj - r

0 down vote favorite I successfully import a polygon shapefile with readOGR, however the information in the .prj file is not being imported. test class : SpatialPolygonsDataFrame nfeatures : 19407 ...
2
votes
1answer
616 views

GeoTools and PostGIS with ESPG:3857

I'm trying to use both PostGIS and GeoTools with the same ESPG:3857 projection, however, it looks like the projections in PostGIS and GeoTools differ. This is what I have in PostGIS: PROJCS["WGS 84 ...
3
votes
2answers
203 views

Geostationary Satellite Projection

What is the equation needed for forward and inverse transformation of Geostationary Satellite projection.?. How to convert it to Geodetic and vice versa. Geostationary satellite projection is ...
3
votes
2answers
165 views

Partial Map Pixel Projections

I have the following: A PNG or JPG of a random width and height, in pixels, that represents a partial map of the world (i.e. a rectangle of the United States). The four corners of this image are ...
6
votes
2answers
79 views

Define projection at the record level

Hopefully this isn't too dumb a question, but is it possible to define projection at the record level, instead of a whole layer or table? I want to create a "project" database for all the work my ...
1
vote
0answers
126 views

Incorrect coordinates when reprojecting NAD27 to NAD83

I have some historic UTM coordinates as NAD27 (556787, 7169250) which I entered into a spreadsheet and have imported into QGIS. I assign them the projection Nad27 / UTM zone 12N (EPSG: 26712) I ...
3
votes
1answer
94 views

Rhombus shaped pixels when viewing an image referenced in WGS84

Following the Question What is the projection of WGS84 in GIS software?, in the comments section of the answer http://gis.stackexchange.com/a/73578/5256, Jake very well explains that Because the ...
1
vote
1answer
126 views

Change projection system .tif file [duplicate]

I have a list of .tif files which have the wrong projection system (NAD_1983_UTM_Zone_13N). However, I want to have those files in (WGS_1984). I want to do this by a script that can transform tif ...
4
votes
4answers
1k views

What is the projection of WGS84 in GIS software?

WGS84 is a reference ellipsoid that determines coordinates of every point on Earth using latitude, longitude and height about the its surface. This ellipsoid is often used as a base to make maps. ...
1
vote
2answers
221 views

Shapefile point coordinates to lonlat

I'm currently trying to parse a shapefile (http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf) with c++. While I have no problems parsing all the data I need, there is a problem with the ...
2
votes
2answers
2k views

Meridian convergence. True north, magnetic north and grid north

I'm having difficulty wrapping my mind around meridian convergence, the horizontal angular distance between true north and grid north. Say I want to determine if a feature lies to the east or west ...
1
vote
2answers
163 views

Using a different projection to calculate areas using the Field Calculator

I have a dataset that is in a WGS84_UTM projected coordinate system, can I force the Field Calculator to use another coordinate system when I use it to calculate areas using pythons ...
0
votes
0answers
42 views

matching open layers plugin Google earth to my data

I'm novice to the GIS and am trying to figure out how to keep my datapoints matching to the same projection on Google Earth satellite that I downloaded through the Open Layers Plugin. My data is in a ...
2
votes
2answers
300 views

Suitable projection for a map of Japan

I'm making a map of Japan in QGIS which will span UTM zones 54 and a small part of zone 53 (central and North Honshu). I'm using Natural Earth raster and shape file datasets with some WSG84 based ...
6
votes
3answers
421 views

How does ArcGIS determine which transformation to use when projecting on the fly?

How does ArcGIS determine which transformation to use when projecting on the fly? Where this would come in would be going from NAD 83 to WGS 84. Multiple transformations could be considered so how is ...
2
votes
1answer
744 views

Canvas Units to Degrees, Minutes, Seconds

I am using the WGS 84/UTM coordinate sysytem. When I go to > Project Properties / General / Canvas Units to Degrees, Minutes, Seconds my coordinates are wrong. I am using QGIS 2.0.1
3
votes
2answers
76 views

How to fix Raster Dataset with numbers in Extent that look like latitude/longuitude but say metres?

In ArcGIS for Desktop 10.1, the Spatial Reference of my Raster Dataset reports that its units are metres (well meters) but the values look like decimal degrees e.g. -33 degrees is highly plausible but ...