Questions tagged [global]

For questions regarding world-wide study or data.

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GloH20 Global Koppen Geiger Raster Values

I am trying to use the global KG classification raster from http://www.gloh2o.org/koppen/. Everything seems to be working fine, but the values from the raster seem to range from 0 - 30, however the ...
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4 votes
2 answers
146 views

How to use ISEA projection?

The projection named ISEA - Icosahedral Snyder Equal Area has a (supposedly) good implementation in the PROJ Library, proj.org/isea, that is used by PostGIS, QGIS, etc. The example is agnostic - was ...
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221 views

Seeking simple vector layer of all countries in world

I'm looking for a vector layer of all countries in the world and (only) their mainland borders, to be used in QGIS 3.10.11. I've searched in a quite few places, including Eurostat, MapTiler and ...
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27 views

Which projection is best when implementing regional datasets in a global one?

I have a question regarding the projection. I would like to set up an interactive atlas where the base layer is a global overview of e.g. peatland. In a next step, I would like to set into the global ...
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1 vote
1 answer
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NASADEM total dataset size

I've recently started investigating NASADEM for some terrain visualisation tasks, and noticed that the total number of tiles on the Earthdata portal is way fewer than the global ASTER GDEM v003 ...
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1 answer
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What global (or very large area regional) digital elevation models (DEMs) products are publicly available? [closed]

What global or large regional area DEM and/or DSM products are publicly available?
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268 views

Generate global extent hexagon grid tessellation in ArcGIS Pro

I am trying to generate a global hexagon grid at 1 km2 resolution spanning the entire globe as an equal area grid using ArcGIS Pro's 'Generate Tessellation' function. I've tried it in different CRSs ...
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6 votes
2 answers
327 views

Reproject, then clip or clip, then reproject?

I have a fairly simple question. I have a global categorical land cover map that has no projected coordinate system (i.e. it uses the EPSG:4326 coordinate reference system with no projection). My ...
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1 vote
0 answers
201 views

Generate synthetic trajectory dataset that has global coverage

I want to generate a spatial trajectory dataset which basically contains tuples - (lat,lon,time), grouped together by an identifier so they form trajectories. In addition, I want this dataset to have ...
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  • 572
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25 views

Fixed Distance Buffer Gives Inaccurate Distances

I have a world map shapefile showing all continents. Each of the shapefile is projected and I need to buffer each of the continents with a 1000 km buffer, but all my buffers show incorrect distances ...
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0 votes
1 answer
32 views

Define spatial reference system and reproject CleanTopo2 raster?

I would like to use the CleanTopo2 raster from http://shadedrelief.com/ to generate a hillshade for a main map of the conterminous United States and inset maps of Alaska and Hawaii (plus portions of ...
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1 vote
0 answers
221 views

Generate custom WKT Coordinate System definition from local / WGS84 pairs of coordinates [closed]

I am wondering if it possible to create a custom WKT for coordinate transformations based on pairs of WGS84 lat/lon and the corresponding local N/E values. So like a minimum 2 pairs? If so is it ...
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1 vote
1 answer
997 views

EPSG codes for projections to use when computing the area of global polygon sets in python env

The general answer to this question is "Use any equal area projection in units of meters that covers the world". Python code needed to make use of this is short and sweet: import geopandas as gpd ...
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1 vote
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365 views

Correct Buffers crossing dateline in sf package in R

Using the global coral reef distribution data provided by UNEP https://data.unep-wcmc.org/datasets/1 I have been attempting to buffer around the points and polygons of coral reefs. The point buffers (...
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1 answer
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Can percent overlap of polygon layers be calculated in geographic coordinate system? [duplicate]

I have two global polygon shapefiles in WGS84, and I would like to generate spatial stats on the % area of one shapefile that is overlapping the other. I understand that geometric calculations such as ...
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1 vote
1 answer
107 views

Tool in Tool Palette as a parameter for Button

I built a simple toolbar with Tool Palette and Button. Button should make a selection according to a global parameter which can be set by selection of Value in Palette box. I.e. if I choose number "1"...
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2 votes
2 answers
188 views

Seeking data for global base map?

I'm part of a group making global visualization software. I need to find earth imagery (visual range and hopefully IR as well) between 500 m/pixel and 75 m/pixel. The blue marble next generation ...
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-1 votes
1 answer
146 views

List of global geopolitical areas? [closed]

I'm building a fake-data maker in R (a package that will quickly generate realistic data for testing and training purposes). In order to be able to do geographical analysis stuff, I'm looking for a ...
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1 vote
1 answer
157 views

Changing global template features to reflect in other maps

I'm working on a project that involves 20+ map figures. We currently are working with a .mxd in which we are using as a template for these figures. It's most likely that our client will want some ...
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2 votes
1 answer
522 views

Seeking global (worldwide) list of street abbreviations?

I'm looking for a list of street and road names abbreviations (e.g Street -> St, Avenue -> Ave. and so on). All I've seen are country-specific lists. Is there a global one, or at least a dataset to ...
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1 vote
0 answers
112 views

Global NetCDF datasets with station time series data?

I´m working on a web application which uses temperatur and precipitation data. Currently i´m using only globally interpolated, multidimensional rasterdata from terrestrial stations (queried with x,y,t)...
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  • 121
7 votes
3 answers
9k views

Global shapefile of biomes/ecoregions?

I'm looking for a shapefile with this kind of information, only at considerably higher detail. In North America, ecoregions are classified by levels and grouped by vegetation type at much higher ...
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  • 121
1 vote
2 answers
369 views

What CRS to use when creating buffer all over the world in QGIS

I trying to create buffers (50km) around many points all over the world (airport locations) in QGIS. I will then overlay these buffers with a world-wide raster dataset so I can extract information ...
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2 votes
1 answer
1k views

What methodology is used to quantify global warming?

This article in the LA Times says: The first detailed global temperature measurements were recorded in 1880. Since then, nine of the 10 warmest years on record have occurred since 2002, according ...
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1 vote
2 answers
424 views

medium resolution Earth coastal outline in tabular form

I'm generating my own images in Python and Blender. What I need is data that I can read directly from a table/file to draw coastlines with 1 to 10 kilometer resolution. I'm not familiar with high ...
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2 votes
2 answers
264 views

does a cartoDB world shapefile exist?

Does anyone know what cartoDB uses for country boundaries on their standard basemaps e.g. cartodb world flat blue? A shapefile would be really useful as doing global maps (using country polygons) look ...
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127 views

Up-to date agricultural land use

I'm looking for data on commodities (corn and potato). Tools such as USDA's cropscape (http://nassgeodata.gmu.edu/CropScape/) are great but lack global cover. I found this dataset http://www....
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1 vote
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38 views

Group cities into MSA/Agglomerated areas

I've been asked to do some research where I compare survey data to some population numbers. Unfortunately, I think it is likely the case that people who live in smaller cities that are close to large ...
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  • 111
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2 answers
436 views

Seeking global roads information preferably with traffic volume?

Im looking for a high quality global roads database. The only constraints I have is that it should be completely open (even foe commercial use) I have looked into some publicly available databases ...
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1 vote
3 answers
1k views

World map with clear difference between land, sea and inland waterways

I'm looking for a free high resolution map that clearly indicates the land and sea in the world. I need it to calculate distances over sea between ports. Additionally it should also include inland ...
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1 vote
2 answers
728 views

Does a 'light' version of global OSM map exist?

I need a global map for my project, but without POIs and other unimportant objects for me. Only big cities and country borders. My project will work in offline network therefore I need a local server ...
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1 answer
51 views

Creating other shared objects like map (CMV)

We need to create an object which is accessible from the controller and widgets. Rather like how we can currently access the map object. Could anybody shed light on how this can be done?
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3 votes
1 answer
160 views

Looking for smallish raster of global elevation data

I'm trying to find elevation data for the whole globe for a simple mapping application and I'm not having any luck. I really don't want anything fancy, just something like a 4000x2000 raster of ...
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2 votes
2 answers
3k views

Where can I find a global geocoding dataset based on postal code?

I'm looking to purchase a dataset (with a contract for updates) of postal codes to lat/long and city names for as much of the world as possible. Ideally the data would look like: country_code ...
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  • 121
1 vote
1 answer
623 views

Where can I download Real time Traffic and weather data for the world?

Where can I download real time data for traffic and weather? I'd like to use it as an overlay on a mapping service of my choice (eg. Google maps, OpenLayers etc.)
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6 votes
1 answer
475 views

Is there a name for map projections that produce two disks?

I've seen lots of world maps in the shape of two disks that touch, each one a separate projection of one hemisphere onto a disk -- usually the Western Hemisphere and the Eastern Hemisphere -- so ...
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14 votes
2 answers
4k views

Projections appropriate for global analysis that preserve area and that preserve distance (but not necessarily in the same projection)

I am looking for a projection (or a set of projections) that decently preserve distances so that I can buffer every country in the world and have a similar level of minimal distortion for each. I ...
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1 vote
0 answers
118 views

trim a global quadtree by population density?

I'm looking for a way to match people so as to find other members that are 'nearby' - not for those dreadful 'girls near you' ads, don't worry ;_) Of course 'nearby' in the country is a different ...
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1 vote
1 answer
294 views

Global Geo Api places

I'm looking for a global geoapi for the places. I see Facebook places, google places, simplegeo, factual etc... Why not create an API that includes all places? Free and easily accessible as ...
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52 votes
8 answers
86k views

Seeking administrative boundaries for various countries?

After learning about the US Census's TIGERLines datasets I've working with the following layers, from the USA data Country boundaries State boundaries County boundaries City boundaries ZipCode/...