A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane

learn more… | top users | synonyms (1)

1
vote
1answer
42 views

$area calculation doesn't work or wrong projection?

I've been reading the QGIS manual and I've encounter a problem I don't know what to do. I downloaded data from OpenStreetMap and the raster from http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp The ...
2
votes
1answer
65 views

Issue rendering polygons at global scale when using the Robinson coordinate reference system in QGIS 2.10

I am trying to create a map using the Robinson coordinate reference system (EPSG:54030) in QGIS 2.10, on Mac. I used the 'on the fly projection' feature in the Project Properties. My base layer is a ...
0
votes
0answers
17 views

Google Earth Mapping in Beijing - Why is it shifted? [duplicate]

When using Google Earth Pro, the road network and the underlying imagery do not line up. At first I thought this was a road network issue. However, when I geolocate addresses using the Baidu ...
0
votes
1answer
245 views

Zoom Scale in OpenLayers 3

Need to change the default zoom of OpenLayers 3 to do so adapted scales, type [1: 100000, 1: 50000.1: 25000.1: 10000.1: 1000.1: 500] have seen in Openlayers2 if you can, but at 3 I have not found a ...
4
votes
1answer
73 views

What projection should I georeference this historical map to?

I'm using ArcGIS. I have a historical map from 1884. It has bathymetry information which I would like to compare to modern bathymetry models with as much accuracy as possible. I don't know what ...
2
votes
1answer
99 views

GeoServer WMS correct WFS wrong coordinates for line features?

I'm calling my geoserver with WMS and later WFS to retrieve vector data (both times EPSG 4342. All features are correctly rendered in WMS and QGIS, so I'm sure the original data is fine. The original ...
2
votes
1answer
144 views

Adding OpenLayers basemap to a QGIS project changes the CRS to WGS 84 / Pseudo Mercator

I have a QGIS (2.10.1) project that contains several shapefiles, all of which are EPSG:3338 (NAD83 / Alaska Albers). The project property CRS is also EPSG:3338. All of the shapefiles display ...
1
vote
0answers
36 views

Geographic Center of Earth centric Projections [duplicate]

This is more a question born out of curiosity than actual needs, but this seems like the right place for it. Based on What is Centroid of all lands of Earth? I was wondering what world maps centered ...
1
vote
0answers
28 views

How can I change the projection used by the QGIS Browser preview?

QGIS Browser has no settings in the UI. Is there any file or so where I can define this?
3
votes
1answer
91 views

Disparity between QGIS and ArcGIS for Desktop georeference results?

I am georeferencing a static map in JPEG format. I would prefer to use QGIS for a variety of reasons. I've never georeferenced with QGIS before, so I may not have the process quite right. I ...
0
votes
1answer
139 views

layers don't match on OpenLayers

So in my Openlayers 3.9.0 I use Bing Maps and OSM layers, they both are EPSG 3857 var layer = new ol.layer.Tile({ source: new ol.source.OSM({}) }); var bingMapsAerial = new ...
0
votes
0answers
22 views

Geographic projection for ASCAT metop-a product

I have an ascat bufr over souther south America and I need to project raster data over a map. What is the right projection for this product? I'm lost with this options: ortho, mercator and ...
1
vote
0answers
36 views

Loading AHN files correctly into MicroDEM?

In the netherlands we have the ahn elevation data files(to be found on: http://geodata.nationaalgeoregister.nl/ahn2/atom/ahn2_05m_ruw.xml) (based on rd projection). If i imort these files into ...
2
votes
2answers
64 views

Convert NAD_1983_Georgia_Statewide_Lambert to NAD83

All I have a ESRI generated shapefile that uses: NAD_1983_Georgia_Statewide_Lambert Here is the projection information: ...
3
votes
1answer
42 views

What projection is this?

Can anyone figure out this projection? Eckert III looks close but is not quite right.
3
votes
2answers
131 views

Which SRIDs to use for what tasks?

I try to understand the idea behind the different Spatial Reference Identifiers. I understand that the different SRIDs identify different projection views on the earth and that they are important for ...
5
votes
2answers
208 views

Coordinate/projection system issue in ArcGis 10.3

I am new in this community and I am also a new user of ArcMap. I am facing a problem, my shapefiles are in a GCS WGS 1984 and I have to add a new shape file that is in a projected coordinate system ...
1
vote
0answers
42 views

Sinusoidal Projection and ArcInfo Sphere Datum Woes

I am using published forest loss data (found here: http://glad.geog.umd.edu/indonesia/data2014/index.html) that uses the ArcInfo Sphere datum with a sinusoidal projection. I am seeking to transform a ...
1
vote
1answer
88 views

Bringing multiple non-projected CAD .dwg files over to ArcMap as a projected ESRI .shp

Is there a streamlined method to bring over CAD .dwg files that have unknown coordinate systems into ArcMap as ESRI .shp files and project the coordinate system of each new .shp accordingly? I have ...
2
votes
1answer
32 views

Why does not equal computing line in `OpenLayers` with `ArcGIS` when i use measure control?

My map projection is: "EPSG:900913" ,Display projection is "EPSG:4326" and units is "m", however does not equal the length is calculated in OpenLayers with ArcGIS, in fact Openlayers show the length ...
1
vote
1answer
87 views

Understanding precision of ArcGIS geodatabases?

I would like to know how precision is handled in ArcGIS software. Is it using a real Computer Algebra System engine, an arbitrary precision library or do others tricks to handle precision ?
2
votes
1answer
122 views

How to make slope map from elevation map in Lat/Long?

I have an elevation raster map of the world, in Lat/Long. When I make a slope map, the results of the raster cells will be either 0, or values close to 90. The problem seems to be that the Slope ...
2
votes
1answer
101 views

Natural Earth doesn't render well in Robinson World projection

QGIS Pisa 2.10.1 Mac Pro, Mac OS I don't seem to be able to create a simple World Map using the Natural Earth Dataset and the Robinson World projection, unless I zoom in. What could be the problem? ...
0
votes
1answer
115 views

Use lamber 93 imageOverlay with leaflet on top of OSM tiles layer

I'm trying to use a lambert 93 image overlay on top of an Open Street Map title layer. var map = L.map('map'); L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', { }).addTo(map); var coords = { ...
1
vote
0answers
58 views

Data not showing in QGIS when connecting to Oracle

I have an Oracle XE 11g spatial database that is connected to a web map. All the layers of the web map are stored in the database and they work just fine. I sometime need to edit some of the layers in ...
0
votes
0answers
61 views

Does Leaflet handle TopoJson in OSGB EPSG:27700 projection?

I already have a Leaflet map showing custom base map tiles in British OSGB projection, EPSG:27700 (using the Proj4Leaflet plugin). I would like to overlay some nationwide admin boundary data in the ...
0
votes
0answers
44 views

Old MIller projections Bipolar Oblique Conic Conformal/Oblated Stereographic definitions?

I'm attempting to georeference and warp some old toposheets that are various old projections including the following: Miller Oblated Stereographic Projection Bipolar Oblique Conic Conformal What's ...
2
votes
3answers
277 views

How to create a Projection from a CRS string using pyproj?

I'm trying to convert between two coordinate systems using pyproj: import pyproj p1 = pyproj.Proj("+init=EPSG:4326") p2 = pyproj.Proj("""PROJCS["NAD27 / California zone ...
1
vote
0answers
47 views

GPS point elevation vs Contours layer elevation

I have some survey grade GPS points whose elevation is approx 55 feet lower than my contours layer elevations. I am using 1 ft contours and comparing point elevations with contours in the same ...
2
votes
3answers
287 views

What is the altitude difference between WGS84 and NAD27 Zone II?

I have a point cloud in a piece of software and have exported the point in both WGS84 and NAD27 State Plane California Zone II (in US survey feet). The WGS data looks like this, with elevation in ...
4
votes
2answers
338 views

Map projection process for three-dimensional point cloud

I have some points given in ECEF coordinates (or LatLongAltitude based on WGS84, which is interchangable in my understanding). Currently I am working on a mapping software which allows to visualize ...
0
votes
0answers
29 views

Project (Data manager) plus Add XY results in new data being rotated

I have point data in decimal degrees. When I want to convert to local UTM data I have going through the usual Project (Data Manager) to project from LAT/Long to UTM and then when I add XY to the new ...
0
votes
1answer
42 views

Batch reproject shapefiles in subdirectories

I have a catalog tree and in every folder I have a number of shapefiles, images and mxd files. The shapefiles are all in Greek Grid projection system (EPSG: 2100). What I want to do is to batch ...
1
vote
2answers
133 views

Why does the OpenLayers plugin override the predefined projection?

What I am trying to say is: You import a shapfile into an empty QGIS and the QGIS environment gets the projection system of the imported shapefile. You import another shapefile into QGIS. The ...
0
votes
1answer
35 views

Reproject OpenLayers.Layer.OSM

In my map a set projection and displayProjection as EPSG:3763 and i can see my vector layers...they are EPSG:3763 Projections. Now i need a simple map behind my vector layers and i put this layer: ...
0
votes
0answers
40 views

How to get a mercator projection from a “disk photo”

I'd like to build a real 3d globe of Pluto using latest images made available from New Horizons. I know how to convert a mercator projection into a "12-gores" projection, suitable to be glued over a ...
0
votes
1answer
124 views

Are ArcGIS' UTM zone designations simplified?

I was recently given a document showing the UTM zones as they appear over the whole Earth. Each zone is 6 degrees longitude by 8 degrees latitude. A numbering system proceeds from 1 to 60 from -180 ...
0
votes
1answer
63 views

What is the type of EPSG of longitude/latitude (not Point) co-ordinates?

I want to know that what is the type of projection (900913, 4326 or so on..) of long/lat co-ordinates. I happen to come across a slight confusion while querying planet_osm_lines when I dump ...
0
votes
1answer
193 views

Shapefile extent units in decimal degrees but values in meters

I have a shapefile that had its geographic coordinate system defined as the projection NAD 83 UTM Zone 18. The scale of the layer was correct but it was at the wrong point in space. I redefined the ...
3
votes
3answers
104 views

How to overlay a map of Europe on a map of Australia?

I'd like to overlay the cities of Europe on Australia for distance/size comparison purposes using QGIS and I'm wondering how best to achieve this while preserving distance between the European cities? ...
2
votes
1answer
320 views

Create Circle and Marker on Click in OpenLayers

I want to create a marker and buffer around it with a given radius on map click event. Marker is displayed successfully but the polygon doesn't display. I guess there is problem in projection setting. ...
0
votes
0answers
53 views

Setting units for arcpy fishnet tool, given unprojected input

I'm trying to use arcpy to create a grid over each of a large number of metropolitan areas across the US. I'm iterating over each metro and trying to create a grid over each one using the "fishnet" ...
0
votes
1answer
52 views

Getting wrong values trying to convert to a latitude longitude system

By using listgeo I got the following information: PCS = 31468 (name unknown) If I am not mistaken this translates to DHDN / 3-degree Gauss-Kruger zone 4, and by using this site I got a proj4 ...
1
vote
1answer
149 views

Using OSGB (ESPG: 27700) projection in Openlayers with MousePosistion

I am trying to display Ordnance Survey Grid references (ESPG:27700) on a set of BaseMaps with the MousePosistion control. From looking through the OpenLayers samples and this forum samples I have ...
1
vote
1answer
51 views

Choosing projection for calculating 2D 3D area in New Zealand?

I'm trying to use Surface Volume tool in ArcMap to calculate 2D and 3D area of a catchment. What would be the best projection to use and how do i check the maximum error of the estimation?
3
votes
1answer
127 views

Tilted projection in QGIS

I'm trying to add tpers projection as a custom projection in QGIS 2.10.1 In the Custom crs dialog I'm adding the proj.4 text: +proj=tpers +h=500000000 +lat_0=19 +lon_0=99 +x_0=0 +y_0=0 +a=6371000 ...
0
votes
0answers
30 views

Projection Discrepancy

I'm creating a system that pulls Longitude/Latitude data from the MapQuest hosted Nominatim service. I'm using OpenStreetMap/OpenLayers to display markers on a map. In order to compute the location to ...
3
votes
1answer
108 views

What projection to use to get a game map into QGIS?

I have built and maintain a SWTOR game map atlas. At the moment, it's all static jpg maps, but I would like to get the info into an actual GIS software to get more functionality and make my website ...
0
votes
0answers
41 views

reproject satellite orbit values from irregular grid to regular grid

I have a ncdf file containing measurements covering a satellite orbit. The ncdf contains the corresponding latitude / longitude fields but they ar irregularly spaced. I tried rasterizing the values ...
0
votes
0answers
33 views

QGIS to Leaflet Projection Weirdness

I've been using the mmqgis tool to create a hex grid. It loads up in QGIS looking good, but when I save it as geojson and load it up in leaflet it gets stretched (see attached). It starts life as ...