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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17 views

Error using gdalwarp in EPSG:4326

I tried to change the projection of AMSR-2 in Python using: 'gdalwarp -geoloc -t_srs EPSG:4326 C:\GW1AM2_201301311114_050A_L1SGBTBR_1110110.vrt C:\test100.tif' It said there are something wrong ...
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1answer
44 views

metes and bounds from historic plans

I have an historic map from 1912 in feet and has metes and bounds displayed. I am going assume one point on the map (a lot boundary intersection) is the same as it is now and then use the metes and ...
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1answer
40 views

Do different RDMS use different SRID's to identify the coordinate system of a spatial object?

I'm looking for a reference that lists a standard SRID for a given CRS. Do RDMS's utilize a standardized SRID, such as OGC? Or is it unique to the RDMS?
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1answer
75 views

Guessing unknown projection in Malaysia

I have a database of northings and eastings of boundary markers of land parcels that are in a form that I cannot pin on any format. I would like to perform some conversions on them so that they can be ...
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0answers
51 views

Basemap (Matlibplot) not plotting GPS WGS84 coordinates accurately

I have a list of lat,lon coordinates from Flickr pictures taken in Sydney (see here) When I plot these points on google maps, the locations are correct. However when I use my Basemap the results are ...
2
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1answer
46 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 ...
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31 views

Convert EGM96 gps elevation to WGS84 ellipsoid elevation.

I have GPS elevation data (300k points) in EGM96. These points are located on the East US coast. I realise i need to work out the difference between the EGM96 and WGS84 ellipsoid in this region to ...
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1answer
30 views

How do i identify unknown coordinates reference system for my data [duplicate]

I have several shapesfiles which perfectly overlay but the coordinates reference system is unknown. I need to overly these with other data in a different coordinate system. I tried initially to ...
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0answers
22 views

Can I assume that ENU Coordinate are already projected?

I have an application where I need to track a vehicle position in range of max 50km. I implemented the ENU coordinate system so my future calclutaion would become easier to impelement (e.g. generating ...
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1answer
40 views

How does the offset values of LAS files relate to their coordinate system?

I have a conundrum concerning LiDAR data, the stored point offset, and the coordinate system. I process large amounts of LAS data in TerraScan (TS), which sits on top of Microstation (MS). I receive ...
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2answers
81 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 ...
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1answer
50 views

Digitized GIS Data - Wrong Coordinate System, Right Location

I (correctly) georeferenced a JPEG to an existing shapefile that was in the correct coordinate system. I then proceeded to create line feature classes by manually tracing some of the features (roads)...
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1answer
74 views

Difference between CRS(Coordinate Reference System) and SRS(Spatial Reference System)

I could see that CRS and SRS are referred as different components in this question Is WGS84 itself a Coordinate Reference System? Could anyone please explain whether CRS and SRS are same or different?...
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1answer
23 views

Importing USGS ned30m (NAD83) into Project (NAD83/Conus Albers, OTF on): coords still Lat/Long

I apologize for posting yet-another-gis-novice's confusion about CRSs, but I have researched the issue and am surprised by what I'm seeing. In simplest form, I open a new project set On-the-fly (...
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1answer
35 views

Conversion of Sirgas2000 projection system to wgs84

I am having a bunch of .csv files containing "x" and "y" of some locations (to be specific, Brazil and the coordinate system is SIRGAS 2000). I want to convert them into wgs84 i.e, lat/long using ...
3
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1answer
121 views

Converting between coordinate systems for LAS file using LASPY

I am trying to convert a .las file from WGS84 to UTM17. I have some drone imagery that was used to generate a 3d point cloud/ .las file, but it is in latitude/ longitude instead of easting/ northing. ...
5
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1answer
54 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 ...
2
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2answers
46 views

QGIS CRS Coordinate Reference System — Generated vs. Specified — error levels?

Below image appears to indicate that the vector layer data was identified as NAD_1983_HARN_StatePlane_Florida_North_FIPS_0903_Feet, which is a well known (to QGIS) CRS. However when the layer was ...
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15 views

Inconsistent coordinates of centroid were found using the given value of radius of curvature in the prime vertical and in the meridian

I am currently writing a function on geodetic datum transformation in Hong Kong by referring to the Explanatory Notes on Geodetic Datums in Hong Kong by the Survey & Mapping Office of the Lands ...
2
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0answers
34 views

Why is grid north so offset? [closed]

I am not a GIS professional, only a casual orienteering enthusiast seeking an explanation from experts. The plat of my property gives bearings and distances for each of the lines, as does the deed, ...
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2answers
54 views

Transformation from EPSG 31983 to EPSG 4326 change only one axis (R + ggmap)

I'm trying to convert my shape file with spTransform(), but it's not successful. I don't know why it's changing only one axis. I want to change the axis into decimal degree. # Libraries --------------...
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1answer
64 views

Using Postgis spatial index in st_distance operation based upon explicit SRID column

I have two large tables with data that spans over multiple regions of the U.S and needs a defined SRID column in atleast one the tables to denote which coordinate system should be used for area/...
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1answer
30 views

Grid clipping issue in Layout

I'm having an issue making a figure for a poster with ArcMap. I'm trying to make a grid that follows the map boundary in a Lambert Conical projection, and it's not coming out right. The map boundary ...
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2answers
110 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 ...
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1answer
231 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
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2answers
156 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 ...
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0answers
46 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
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1answer
29 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
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1answer
97 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 ...
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0answers
71 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
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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
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1answer
36 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 ...
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1answer
108 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
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1answer
34 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
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1answer
58 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
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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 ...
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1answer
55 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 ...
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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 ...
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2answers
152 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
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1answer
88 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 ...
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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
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1answer
56 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 ...
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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
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0answers
15 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 ...
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0answers
33 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 ...
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1answer
47 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 ...
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1answer
22 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?
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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
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1answer
272 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 ...
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0answers
47 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 ...