A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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7
votes
1answer
208 views

Convert longitude/latitude to pixels on the map

I have a map from here. I want to be able to simply convert arbitrary lon/lat pair to pixels on the map (also the ability to do reverse conversion). The maps come with .tfw file and projection info, ...
2
votes
2answers
98 views

Converting shapefile CRS from WGS to UTM in QGIS

I want to calculate point distance but the result is null, and apparently it is because the point and the raster file have different CRS. The raster is UTM, and the point is WGS84 I follow the ...
0
votes
0answers
44 views

Intersect two same extent shapefiles, but got error 000117

I have used intersect(Analysis Tool) to intersect two polygon layers. But I got error 000117 after ran intersect tool. Same error message happened when I use clip (Analysis Tool). The answer and two ...
1
vote
1answer
27 views

Bent raster after Build Overviews for mosaic dataset using ArcMap?

I created a mosaic dataset from a set of 12 tiff's spanning the united states. Before running Build Overviews, the images all join together nicely. But after, they look like this: Any idea what ...
2
votes
1answer
88 views

Coordinate transformation differences in ArcGIS, QGIS and Google Earth Pro

I have a shapefile with points in Adindan UTM 37N coordinates. Now there seem to be roughly two ways of converting those coordinates to WGS84. When loaded in Google Earth Pro the points are about ...
1
vote
0answers
65 views

DEM / Basemap Alignment

The image below shows the problem I'm facing. I'm trying to align a DEM with the ArcMap Imagery Basemap. Unfortunately, I can't make them to perfectly align. I tried changing the coordinate system to ...
2
votes
1answer
38 views

confused about distances on the wgs-84 ellipsoid

As far as I understand given a certain latitude the length of a degree of longitude is constant. So using any distance calculator (I use Mathematica here) this equals: (circumference of the earth) ...
3
votes
1answer
33 views

CRS and QGIS georeferencing for Cassini projection

I have scans of OS 6" series maps which I understand are Cassini projection. According to an article my Mugnier, Photographic & remote sensing, Oct 2003 they had the typical scale factor equal ...
1
vote
1answer
89 views

CRS transform from EPSG 4326 (WGS 84) ? to EPSG 27700 (OSGB 1936 / British National Grid)

I have a table which is an import of a shp file from www.geofabrik.de/ England > Roads. I've tried to change the CRS to EPSG 27700 but when I add this back to QGIS along side other layers which are ...
2
votes
1answer
31 views

My point shape file having missing spatial reference information

I am using ArcGIS 10.2.2. I got a shape file with points representing spot elevations in my study area. This file has been provided by a third party institution. The coordinate system is missing ...
2
votes
1answer
56 views

Unknown set of coordinates Northing Westing

I've been given a list of sites of vegetation with a "Northing/Westing" location e.g 52 43.569 - 001 44.833 I want to convert them to Easting Northing so I can load them into ArcMap. I've tried to ...
2
votes
1answer
41 views

Find coordinates of point on map

I have scanned map I know it scale and dpi. Is it possible if i know lon-lat cords of some point(X,Y) calculate lon-lat of another point (clicked) on this map? I have read some about georeferencing ...
1
vote
1answer
47 views

MySQL database layers invisible in QGIS

I'm encoutering a problem when connecting a MySQL database to QGIS. When the connection is established and a layer is imported, the layer itself will not render and thus isn't visible. The layer ...
1
vote
0answers
22 views

Unknown coordinate system produced in 1980 by Japanese company in North Philippines

I am having the same difficulty with one of the report produced in 1980 by Japanese company. The grids format also N 38,578, E 41,400. The project is 390 kilometers north of Manila. I would like to ...
1
vote
2answers
149 views

Is WGS 84 datum, coordinate reference system, or both?

The background to this question is in Understanding difference between Coordinate System and Projection? There @mdsumner commented: WGS84 is not a cs, it's a datum. On a couple of places online ...
2
votes
1answer
75 views

Clipping a raster with a shape layer fails by returning an empty raster (nan - 0)

I am trying to clip a raster layer by a shape define by a polygon. (A previous question was about a line layer clipping, whereas this one relates to raster layer) The resulting layer is however an ...
0
votes
0answers
4 views

Shifted shapefiles with same coordinate system in ArcGIS [duplicate]

I have a strange situation with one of my GIS projects. I received from a client three shapefiles in the same coordinate system (Stereographic 1970 - a projected system). All three files should align ...
0
votes
1answer
49 views

Coordinate Systems for tile packages used in Collector for ArcGIS

I have a geodatabase with multiple shapes, domains etc. Everything works fine in ArcGIS online and as well on the Collector for ArcGIS. For better performance while using a tablet for data collection ...
0
votes
0answers
24 views

Cordinate System Conversions

I have my council installations all in GCS WGS84 but they where mapped in Arc 50 coordinate system. When I display them on my Arcmap they do not coincide with the other layers such as roads and ...
0
votes
0answers
14 views

How to find the angle of difference between two coordinate systems?

I am working on converting u and v components of wind from one coordinate system to another (WGS84 to NZTM2000). In order to do this I need to know the angle of difference between the axes of these ...
1
vote
0answers
32 views

Where can I download a world shapefile with 180-degree central meridian?

Does anyone know where I could download a world shapefile that has a projection with a central meridian of 180 degrees longitude? I have found the following question that provides instructions for ...
1
vote
1answer
37 views

CRS confusion or georeferenced

I have georeferenced an old jpg map against Bing Road maps (OpenLayers plugin) and Raster>Georeferencer. I'm trying to use EPSG:4326 because my PostGIS database uses that. My PostGIS info shows ...
0
votes
1answer
19 views

Transferring coordinates unit from Imperial to metric in Arcmap

I have a raster with NAD_1983_StatePlane_Indiana_East_FIPS_1301_Feet coordinate. Is there any way to transfer the coordinate to metric in ArcMap?
0
votes
0answers
20 views

Layers do not overlap [duplicate]

I am new to ArcGIS. I have some layers. Three of them perfectly overlap and the fourth does not. I have tried with the Projection tool and I have tried so many things and nothing. When I check the ...
7
votes
1answer
252 views

Understanding difference between Coordinate System and Projection?

Can somebody please explain what is the difference between the Coordinate system (WGS 84 for example) and a Projection (Universal Transverse Mercator for example)? What is the difference between a ...
1
vote
0answers
45 views

Formula for Nicolosi Globular Projection

What is the formula for the Nicolosi Globular projection? In other words, what is the function that maps the coordinate (φ, λ) on the sphere to the coordinate (x, y) on the plane? You can assume ...
1
vote
2answers
81 views

How to find the intersection of three polygon layers in ArcGIS?

I have three data sets of San Francisco, TerraSAR-X, ALOS-PALSAR, Radarsat2. I have extracted KML files using Envi Sarscape. In order to find the intersection of these areas, I have converted ...
0
votes
0answers
24 views

Figuring out how to work with state plane coordinate system

I am working with a physical map and we are currently learning about different coordinate systems and how they can be applied. I am really stuck on State Plane Coordinate systems. I have been ...
1
vote
1answer
54 views

QGIS: Converting Projection Coordinate Systems to Geographic Coordinate Systems to replace (X,Y) with Latitude and Longitude

So as the title suggests, I have a shapefile that shows a set of rail lines and I want to display each line independently so I extracted the nodes with Geometry Tools. Unfortunately these coordinates ...
0
votes
1answer
51 views

Changing coordinate system says that geotransformation is invalid?

I am planning on using the MODIS burned area products which were produced by Maryland University. These come as either polygons or rasters. In the user guide it says A shapefile version of the ...
13
votes
2answers
559 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 ...
1
vote
0answers
29 views

proj4js with geocentric CRS

I am developing a little web app to transform coordinates between CRSs. To do that I am using proj4js, but I notice that proj4js can't work with geocentric CRSs. Is there another tool similar to ...
1
vote
0answers
66 views

Geographic vs. projected raster cell size area

I am wondering the best way of knowing how to define the area of each raster cell in global data. Specifically, I downloaded all ~400 tiles of MODIS land cover data, mosaiced them into one, and now am ...
1
vote
2answers
93 views

Coordinates not displaying in UTM

Mac OS 10.9.5; QGIS 2.8.4-Wien; offending data here I want to calculate the centroid of a polygon in meters. However, I cannot get QGIS to display in UTM and I cannot transform/project the data to ...
1
vote
1answer
90 views

Getting inaccurate results converting from New York State projection to NAD83 with Python's pyproj

I've been trying to do a standard coordinate translation between New York State Long Island (ESRI:102718) and latitude/longitude (EPSG:4269)...but I keep getting the wrong lat/lng results. I don't ...
0
votes
1answer
30 views

How to read info from the CRS? [duplicate]

I'm struggling to understand how the geo projections work in practice. The info a the CRS is as follows: {'ellps': 'WGS84', 'no_defs': True, 'proj': 'longlat'} Does it mean that the coordinates are ...
0
votes
0answers
23 views

How to work with a shapefile that has no projection information? [duplicate]

In a shapefile I'm working with there is no information on the projection used. That is, no .prj file. Is there a hack/alternative way of determining what coordinate system the data is in?
0
votes
1answer
48 views

Failed to export vector file from OGR?

I use to transform data points from UTM (WGS84) to WGS84 EPSG:4326. Basically from UTM to Geographic coordinate system both in (WGS84). I tried to do it again but an error message appears. ...
-1
votes
2answers
80 views

Layers with same coordinate system still do not overlap, as they should, even after ArcToolbox Define and Project tools [duplicate]

For ArcMap 10.3: I had two shapefiles, that at one point, were in different coordinate systems. Shp#1 was in NAD_1983_Texas_Centric_Mapping_System_Albers and Shp#2 was in ...
0
votes
1answer
31 views

two layers with same projection do not overlap [duplicate]

I have a boundary layer for an area. the layer properties are top: 4431527.680136 m bottom: 4431199.984995 m left: 569103.516495 m right: 569438.079758 m Projected Coordinate System: ...
0
votes
0answers
23 views

EPSG:4978 or others for Distance

Usually when I have been calculating distances I project to the system which has the tightest crop around my points e.g. for the UK #http://epsg.io/27700-5339 (accuracy: 1.0m) uk = '+proj=tmerc ...
-2
votes
1answer
32 views

which projection are best for large continents [closed]

which projections are best for large continents and mid-latitudes
5
votes
1answer
55 views

How do you display latitude \ longitude coordinates in ArcGIS?

I would like to display latitude and longtitude coordinates (at the bottom of window) for my data which I am editing in different coordinate system. Is it possible?
2
votes
1answer
55 views

QGIS Pre-set CRS/projections missing/unavailable

I am using QGIS 2.0.1 running off of a Ubuntu computer. I have been going through some basic tutorials (http://fossgeo.org/free-qgis-courses/) and have come up against a small and silly little ...
1
vote
0answers
44 views

Python error when using r.reclass on raster with no CRS

I have a set of GRID data (directory of .adf files) that I'm trying to reclassify in QGIS. I'm using the GRASS r.reclass function to try to reclassify the layers, but GRASS keeps failing and ...
1
vote
1answer
55 views

Coordinates are wrong [duplicate]

In QGIS 2.13.2 I have a google map and a shapefile. Now I want to print it with all the necessary items, but I have a big problem with the coordinates. First of all, the coordinates just appear when I ...
0
votes
0answers
49 views

Why is the project tool in ArcGIS (ArcMap) for desktop throwing the “invalid geographic transformation” error?

I'm trying to reproject a point shapefile from ITRF92 to WGS84 UTM ZONE 14 NORTH. On the geographic transformation input field, I copied and pasted the following geographic transformations from the ...
1
vote
1answer
39 views

Leica Cyclone 5.1 TLS Data referencing using Trimble DGPS

I am using a Leica HDS3000 Terrestrial Laser Scanner (TLS) and Cyclone version 5.1 to acquire and process point clouds. Within the manual for Cyclone 5.1, Leica mentions that a user can enter the ...
0
votes
0answers
43 views

Coordinate system for the State of California

I need to calculate, for the whole state of California, the hectares per type of crop. To do that, I have to project my layers. Because I need to work with all of the area of California, I think I ...
12
votes
3answers
497 views

Does transforming to a new projection, then back, affect data accuracy?

I have a feature class (South Carolina counties, so a fairly large geographic area) in NAD83 SC State Plane. It needs to be transformed to a second projection (NAD83 UTM 17), then transformed back to ...