Questions tagged [antimeridian]
The antimeridian, or 180th meridian, is the meridian which is 180° east or west of the Prime Meridian with which it forms a great circle. It is distinctive among meridians in that it is common to both east longitude and west longitude.
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Removing 180th meridian line on map of Russia?
I'm not sure how to remove the line that represents the 180th meridian (international dateline) on my polygon. I have the "Russia Country Boundary 2017" feature layer added from the Living Atlas. My ...
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0answers
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Removing a 'non-gap' gap from a polygon that straddles +/- 180 longitude; looking for an R-based, code solution
I am working with a set of polygons from here: http://lme.edc.uri.edu/index.php/digital-data. In the artic, there are several polygons that straddle the +/- 180 longitude line.
These are single ...
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1answer
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Get a bounding box of a geometry that crosses the antimeridian using OGR
I'm trying to get a bounding box of the geometry that crosses the antimeridian using OGR:
from osgeo import ogr
geom = ogr.CreateGeometryFromJson('{"type":"MultiPolygon","coordinates":[[[[-180.0,-40....
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0answers
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gdal2tiles tiling raster crosses 180 meridian
I have raster that has extra 180 longitude (Chukotka peninsula area) and I would like to make tiles (in gdal2tiles) of this .tif and there are some problems:
When trying to reproject raster to EPSG:...
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0answers
175 views
How to generate a Global Voronoi diagram?
Using arcMap, QGIS and similar software it is easy to create a non-global Voronoi diagram.
The resulting shapefile polygons however are showing weird behavior when crossing the -180 meridian or the ...
2
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1answer
63 views
Reproject with shifted central meridian - dateline gap in ArcGIS
I have reprojected a file of global ocean zoning to Winkel III shifting the central meridian to -180 to center it on the Pacific using ArcGIS 10.5. Doing so, a gap at the dateline appears:
In a ...
2
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1answer
75 views
Removing lines from a polygon that has been reprojected to cross the antimeridian
I have a polygon file in qgis3.0 representing global tectonic plates. I have reprojected the original file in WGS84 (EPSG:4326) to PDC Mercator (EPSG:3832) using only the features that are needed.
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1answer
145 views
data reprojection and the antimeridian
I am trying to produce an earthquake map of the south-west pacific ocean area around New Zealand and its surrounding islands.
In order to produce a map which crosses the antimeridian, I took two ...
2
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1answer
206 views
Line through polygons spanning 180-degree line
In ArcMap 10.2, I am trying to render a shapefile with polygons in the Pacific Ocean, which span the 180-degree line. The resulting image shows a line going through the polygons at the meridian, and I ...
2
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0answers
93 views
Hibernate spatial intersects() over antimeridian
I have a DB full of objects that contain a location (usually a polygon). I have a query defined that uses Hibernate Spatial's intersects() method to find all the objects that are with a box that's ...
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0answers
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How to display the geojson polygon after 180th meridian in leaflet?
Like the vector grid plugin in the leaflet:
http://leaflet.github.io/Leaflet.VectorGrid/demo-geojson.html
see the above example at zoom level 1 or 2
Is there any way to display geojson, not as a tile ...
4
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1answer
337 views
Determine whether a polygon crosses the antimeridian
I'm working on a system that uses bounding boxes as a fast first check for a point-in-polygon filter. My current naive implementation (just taking the min/max lat and lng for all points) fails on ...
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2answers
301 views
Does exist a Python library to generate polygons avoiding antimeridian issues?
If I need to generate a polygon that crosses the anti-meridian, does it exists a Python library that treat such cases (partitioning such polygon and generate a multipart polygon)?
4
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1answer
209 views
Is there an inverse operation to ST_Shift_Longitude in PostGIS < 2.3?
ST_Shift_Longitude(geom) (renamed to ST_Shift_Longitude in PostGIS 2.2) adds 360 to longitudes below 0, thereby (for lon-lat coordinates like WGS84) moving the part of the world "left" (west) of the 0-...
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1answer
266 views
Is it possible to wrap date line with gdal.VectorTranslate()?
I use '-wrapdateline' option in ogr2ogr to split the polygons at the anti meridian. But in ogr2ogr Python port bWrapDateline is hardcoded to False.
Is there a way to pass 'wrapdateline' option to ...
4
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1answer
232 views
Transforming a shapefile from EPSG:3338 to EPSG:4326?
I'm trying to transform this shapefile from EPSG:3338 (Alaska Albers) to EPSG:4326.
When I display the file in EPSG:3338 in QGIS it looks as you'd expect:
But when I display it in EPSG:4326 I see ...
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0answers
218 views
Define polygon across the 180 meridian in DotSpatial
I am new to DotSpatial and I try to define a polygon that crosses the 180 meridian by following:
FeatureSet fs = new FeatureSet(FeatureType.Polygon);
Coordinate[] coord = new ...
4
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1answer
86 views
Un-splitting data that crosses antimeridian in ArcMap?
I'm working with a set of points in ArcMap that crosses the antimeridian (180°). I need to convert the points to a line but doing so creates a line that doubles back and forth across the globe to ...
4
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0answers
580 views
Shapely polygons crossing the antimeridian
Sample data
Consider the following WKT Polygon, crossing the international dateline (antimeridian):
POLYGON((176 49,-65 49,-65 11,176 11,176 49))
And the following points:
POINT(-140 32) # ...
3
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1answer
170 views
Use map projections to find closest point over dateline
I want to identify closest points to a polygon over the dateline in an OGR/Python script. I found this workaround for PostGIS but I'm not 100% certain about the applicability in my case. This may be ...
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2answers
155 views
How to use postgis to reproject 900913 to a different bounding box
The OSM data is in 900913. I need to get 4326, but so that the longitude's range is NOT -180..180, but rather some other, shifted range, based on a parameter. This way, if I need to draw an object ...
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0answers
141 views
GeoJSON<->TopoJSON roundtrip breaks leaflet on antimeridean
For Wikipedia, I'm writing a service that extracts polygons of a country by a given ID, simplifies them, and produces GeoJSON. The PostGIS query produces this GeoJSON:
{"type":"MultiPolygon","...
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1answer
1k views
xarray slicing across the antimeridian
I'm just starting with using xarray for working with n-dimensional NetCDF datasets. I particularly like the techniques for slicing using both indexes and labels (isel and sel):
import xarray as xr
ds ...
2
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0answers
94 views
Unwanted display of 180 meridian in map [duplicate]
When I use the WGS 84 CRS the Chukotka peninsula east of the 180 meridian is shown on the left of the map. If I project (on-the-fly) the map using a Lambert Azimuth projection, the Chukotka peninsula ...
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2answers
964 views
Best-practices for databases and APIs with geographic data spanning the antimeridian
What is the best-practice for storing geographic features (lines, polygons and their multipart equivalents) when these features span the antimeridian (±180° longitude), and need to be sent to and ...
2
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1answer
511 views
How can I convert PostGIS geography to geometry and split polygons that cross the antimeridian
I have a PostGIS 2.2 table that stores polygons as geography type. The table contains several polygons that cross the antimeridian. I would like to split these polygons at the antimeridian and ...
9
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2answers
2k views
Polygons across international dateline [-180..+180 longitude]
I'm trying to generate polygons for satellite orbital swaths.
So far I have a method to generate two lines which represent the edge of each swath in [lat,long]. Some of the swath's cross the ...
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0answers
95 views
how to use st_intersection() with re-projection in POSTGIS?
This is a shipping route from 'Portland to Busan' and I want to check the route against land_polygons like how much distance is traveled by a route through land. And the problem is while checking the ...
1
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1answer
156 views
MapProxy and the antimeridian
I am using MapProxy to use my company's tiled map service (TMS) as a web map service (WMS) for consumption by desktop GIS clients. One of the great advantages is being able to add additional ...
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2answers
1k views
Mapping Russia - Int'l dateline splitting polygon
I am having the issue where the International Dateline is splitting a polygon I am working with. I have a layer of the "Federal Districts" of Russia, and the eastern most federal district is being "...
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0answers
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How to prevent cross-world lines in ggplot world map?
I'm having issues displaying 'great circles' paths and polygons in ggmap, an extension of ggplot2. Please enter the following code to replicate my issues:
https://gist.github.com/Robinlovelace/...
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2answers
1k views
Using ST_MakeEnvelope over the antimeridian
I'm using ST_MakeEnvelope in PostGIS to try and make geometries that cross the international dateline (antimeridian), but they are making a shape that wraps the other way around the globe.
The ...
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4answers
4k views
Splitting Linestrings on the dateline with OpenLayers
A couple of years ago I posted a questions titled "The International Date Line wrap around" @jdeolive suggested I split the features at the dateLine. So I tried.
So when I try to split my satellite ...
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1answer
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Postgis: Is there a way to do an intersection query based on lines while taking into account the dateline?
This is an exact copy of a question I asked on Stackoverflow a few weeks back and still haven't found a good answer for it. The original question is from here: original question.
I've been searching ...
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8answers
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The International Date Line wrap around
Using OpenLayers, I added a WFS layer (on GeoServer) with a filter that returns all features (black) that intersect my polygon (yellow) placed over some Latin American countries within certain dates.
...
