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
359 views

Transforming coordinate that lies outside a grid transform (e.g. NADCON)?

As I understand it, a datum transform (e.g. urn:ogc:def:coordinateOperation:EPSG::1241) based on a grid interpolation method, e.g. NADCON, is undefined outside of the grid of points. Therefore the lat/...
1
vote
0answers
61 views

Is there any way to use Cesiumjs to import 3D Models using the British National Grid (OSGB36)?

I am trying to import a 3D model (.gltf) into Cesium which is in OSGB36 projection, however I know that Cesiumjs doesn't support British projection natively. I've tried changing the origin of the ...
2
votes
2answers
46 views

QGIS Merge rasters without projection edges

I have been trying with no luck to merge forest canopy rasters available through the NLCD (e.g. Grids 102 and 105) using QGIS in Mac (as well as R, and SAGA in Windows). The GeoTIFF grids import and ...
5
votes
2answers
110 views

Why am I getting two different outputs from Python and C++ using GDAL?

I am trying to gather information from a *.tif file using the GDAL libraries. When I open the *.tif file using both the Python API, and C++ API, I encouter two completely different answers. Here are ...
0
votes
0answers
26 views

Why don't latitude and longitude match with others one?

I have a latitude and longitude: 60.011887, 30.37898 When I add marker to openLayersMap I get this marker in another place. Why does this happen? here is the code: var MyMap = (function() { var ...
7
votes
3answers
307 views

Sentinel-2 projection shift

I recently observe a shift in the geographic projection of Sentinel 2 data. Please see the screenshots below for clarification (Granule T33UXP, Band 8 only). The first image was taken on 20160314, the ...
2
votes
0answers
42 views

Calculating Area for data in WGS 84 using ArcGIS for Desktop? [duplicate]

I am using ArcGIS 10.1.1 for Desktop on my laptop. When I try to calculate the area in WGS 1984 the area is disabled. If I work in one projection, say WGS 1984, and calculate area in another ...
1
vote
2answers
71 views

Reprojecting raster from one CRS to another?

I have a .tif raster file which is based on some projected coordinate system (for example: NAD 1983 State Plane California). I would like to export this raster as a .xyz file, but also reprojecting it ...
0
votes
1answer
27 views

Shape files are not lining up [duplicate]

I have two shapefiles, with the same projection but they can not overlay. I understand that the extent is different, but i can not figure out how to change it? Here are the tow layers properties :
2
votes
2answers
201 views

How do I set a CRS when it isn't listed in QGIS? (Mac, not PC)

I want to work with a shapefile that is in a Coordinate System that I can't locate in QGIS for Mac. When I load this shapefile data, it shows up fine, on-the-fly has generated the CRS data most likely ...
0
votes
0answers
19 views

QGIS projection changes only when saving as PDF [duplicate]

The issue I'm facing is that when using a print composer to generate a PDF or image with a google earth / bing backdrop the projection of my layers appears to change from what is shown in designer/...
4
votes
1answer
194 views

How to bulk import ESRI projections into Postgis

Where can I get a file that would allow me to bulk upload all of the ESRI projections into the spatial_ref_sys table of postgis. I know that you can get insert statements on spatialreference.org; ...
2
votes
1answer
313 views

Geoserver projection recognize problem

I'm publishing shape files in geoserver through curl,my problem is that geoserver didn't recognizing the projection which is in ESRI WKT format(layer was publishing).I searched for this problem i ...
3
votes
1answer
28 views

How to obtain attributes of a point layer that falls within a polygon layer of different CRS

I have created my own vector grid polygons in QGIS 2.12.2. This creates a new layer to my project, but it's projected in a "generated projection". I want to view the attributes of points that fall ...
0
votes
0answers
38 views

Projecting a layer to another CRS changes the actual distance

I'm trying to generate a buffer around some 1,000 points. My layer is on WGS-84, so I understand I need to save the layer with a different CRS that works with meters (Israeli one - ITM). However, when ...
1
vote
1answer
63 views

Installing/defining custom projection Nepal Modified UTN in QGIS?

I need to install/define a custom projection Nepal MUTM in qgis 2.14. But I don't know how to do it? Where will I get the projection code to use during defining?
1
vote
1answer
88 views

Shift in the data between CartoDB and stamen layer, Google Maps API

I have a geojson loaded into CartoDB database. And I have a CSV file too. Names field would be common in both the GeoJSON and CSV file. I had written a logic if the place name in CSV matches the place ...
1
vote
1answer
195 views

How to generate a tiled map from a spherical mercator SVG?

I'm not a GIS person; this is really just a side task, so I probably have terminology/strategy incorrect; I would ask that you please bear with me. I have the following requirements for a Qt-based C++ ...
0
votes
1answer
514 views

GDAL to project from pixels to geo coordinates

I am using GDAL library in C++. On my dataset, I have obtained geo transform with GetGeoTransform to GT array (GCP is NULL). Than I use this values for this equation (Source): Xgeo = GT(0) + Xpixel*...
0
votes
0answers
24 views

Multi Projections w/ openlayers 3

I am stuck and I need your help! My app needs to change projection and/or layer on click. I have a layerchooser class which controls the clicks (works well with alert("hellool3")) My main class is ...
4
votes
4answers
138 views

How do I create a map that is not to scale in QGIS?

I want to make a map that isn't to scale and I'm so used to being pedantic about CRS and scale that I don't know where to start. The map that I need to make is a simple guide for people to get to a ...
10
votes
1answer
1k views

Using customized Coordinate System for Archaeological site data

I don't know so much about coordinate systems... In my office we use to deal with spatial data coming from archaeological sites. Each site has its own x-y-z coordinate system (GCS). Three simple ...
2
votes
1answer
52 views

Circles and Projection in ArcGIS for Desktop?

I am using ArcGIS 10.2 and when I run topology on my feature class (which is in NAD 83 Lambert_Conformal_Conic) there were no overlaps. Once I project it into any projection I get overlapping polygons ...
1
vote
2answers
167 views

Comparing features in GIS interface with Google Maps/Bing Basemaps - Which Co-ordinate system to use?

I want to compare some Geographic features in my data with Google maps in ArcGIS platform using a third party application. But I prefer the output to be in Local UTM cordinates. What is the best ...
0
votes
0answers
146 views

OpenLayers 3: projection for Yandex.Maps

I need 3 layers: OSM, Google and Yandex. My view, OSM and Google layer in EPSG:3857 projection, but Yandex layer seems to be in EPSG:3395, so it was displayed not correctly. I've defined the new ...
13
votes
2answers
564 views

Which projection is this data in?

I received a shape file for my project from an agency and was told that they always use UTM. However, the values have too many digits for being projected in UTM. min max x 32507319 ...
5
votes
1answer
462 views

Reprojecting LiDAR data with libLAS

I have a lidar file (file.las) with the following spatial reference: Spatial Reference: PROJCS["NAD83 / UTM zone 11N", GEOGCS["NAD83", DATUM["North_American_Datum_1983", ...
1
vote
1answer
73 views

orthogonal projection of a point onto linestring in PostGIS

I am trying to find the orthogonal projection of a Point (in 4326 SRID) onto a LineString (in 4326). The picture shows the objective. I have tried to use ST_Distance function, but in this case the ...
0
votes
1answer
52 views

How to divide line into three equal parts?

I have a problem with line division. I'm writing a program in JS/C++ generating KML files. I was trying to divide a line using my own function (which is correct on cartesian space): var part1Lon ...
0
votes
0answers
225 views

Map doesn't show anything in img file (WMS-Mapserver)

In a Project we wanted to use OpenLayers and MapServer to display our data using WMS, but we can't find a proper srs or EPSG code. One of the ITC students said, we have to change our MapServer ...
8
votes
2answers
3k 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)) ...
1
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0answers
38 views

Need to match the Coordinate system on vector and raster datasets

I have a google satellite image that I am using as my basemap. The problem is that the shp files that I got from some source are projected in WGS 1984 UTM, Zone 42 North, Meter, but its GCS is '...
2
votes
1answer
52 views

Equal area world QGIS

when I use ArcGIS I normally use CRS: Cylindrical Equal Area (World) WKID: 54034 In QGIS I cannot find the same projection. When I re-project my file in ArcGIS and open it in QGIS it says I am using ...
1
vote
0answers
26 views

Error in using projection system with 1 standard parallel instead of using two?

I have to define a new projection system in ArcGIS but to define the system I am having the parameters for Lambert Conformal Conic Projection with 1 standard parallel instead of 2 standard parallel. I ...
0
votes
0answers
33 views

Is it possible to use DGPS device to take longitude, latitude and elevation values in local geodetic system (i.e. Indian Geodetic System)?

I want to survey a land in India using Indian Geodetic System (GCS Everest India Nepal ESRI: 37203 or EPSG : 24378). Can I define my own projection system in DGPS, so that it can take values in this ...
1
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0answers
60 views

Projection Issues - OpenLayers / MapServer / NAD83 State Plane FT

I am having projection issues with OpenLayers version 2.13 with MapServer and the Proj4 library. Pulling layers in NAD83 State Plane Feet projections on top of an OSM or MapQuest Base Map in Google ...
1
vote
2answers
82 views

Datum shift issue between OSGB1936 and WGS84

I have to work between OSGB1936 and WGS84 and BOTH of these data sets started out life as OSBG1936 BounaryLine data. I thought I was just at the end of a full revision of my master mapping until I ...
2
votes
1answer
54 views

Geowebcache alias for custom projections

Is there a way to configure a projection alias in geowebcache? E.g. if I would like to advertise projection EPSG:25833 and EPSG:32633 to the client, while requesting tiles from the backend using ...
5
votes
1answer
56 views

Pacific-wide Projection for distance?

I have a data set of ~3500 points located across the Pacific Ocean, and am looking to measure the distance from each point to it's nearest coastline to identify the "host" country. I had originally ...
1
vote
1answer
42 views

PTV_Mercator correctly recalculated to WGS84 EPGS:4326 but not correct on map

I have recalculated PTV_Mercator (PTV Spherical Mercator EPSG:505456) coordinates to WGS84 EPGS:4326 coordinates in Excel. And when checking them on Google Maps they show up correct. But after ...
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vote
0answers
19 views

Create points with planar location data

Slightly confused. I need to add 3 point features to an already created map project (state plane projection). The description given to me about the location of the points is the planar location, so no ...
3
votes
1answer
105 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 ...
1
vote
2answers
128 views

Why do my XY cordinates not make sense / show up in ArcGIS 9.3?

In the Add XY Data menu I selected to add a table containing UTME and UTMN coordinates. I selected a WGS84 projection b/c that's what the GPS device that meade the readings was set to use. However, my ...
1
vote
0answers
34 views

Issue on project CRS loading a georeferenced image

I have a georeferenced image in EPSG 26714. When I load it in Qgis 2.14 the project CRS is set to 4326. I asked for the layer properties and the CRS registered is 26714. When I open the same file in ...
3
votes
1answer
53 views

Projection issue with WMTS in QGIS?

I'm trying to connect to this WMTS in QGIS, but I'm having issues that I think are projection related. I use the Add WMS/WMTS dialog and enter this url: http://www.vernoncounty.org/arcgis/rest/...
3
votes
1answer
26 views

Given WGS84 bounding box, is there service that returns most accurate projection to use?

I'd like to find a service to convert lat/lon in WGS84 to an arbitrary coordinate system in metric that will be the most accurate for my bounding box. Does something like this exist? For instance, ...
1
vote
1answer
141 views

Distance measure of ST_ClusterWithin

I use SRID 4326(WGS 84). So what is the measure of distance in ST_ClusterWithin . m, km, degree ? I ask it because in documentation it only says: geometry[] ST_ClusterWithin(geometry set g, float8 ...
2
votes
2answers
372 views

How to project US States in Transverse Mercator [duplicate]

Possible Duplicate: Layers having the same coordinate system should overlap, but they don’t. What’s wrong? I created two different MXDs, one for City of Tucson and another for US States. If ...
2
votes
1answer
4k views

Converting decimal degrees units to km in R?

I am trying to figure out how I can transform my unit of length from decimal degree to km when I import the following simple ArcGIS polygon shape. Ultimately, I would like to have this information ...
0
votes
0answers
13 views

Problem in adding geojson to WMSTile layer

I have problem with adding my geojson file to WmsTile (I see this layer). Here is my code with sample of geojson :