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Questions tagged [global]

For questions regarding world-wide study or data.

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Global Flood Database v1 unmask 'jrc_perm_water'

I am using Google Earth Engine to generate mean area flooded in electoral districts of India. What is a good way to remove the values of permanent water from the 'flooded' band and generate aggregate ...
Tarana Chauhan's user avatar
1 vote
1 answer
39 views

Directly working with data from different platform without having to download it in Google Earth Engine

Is it possible to import and work with data that is not hosted in Google Earth Engine without having to download it? I am working with a publicly available Global Man-made Impervious Surface (GMIS) ...
User2010's user avatar
  • 103
0 votes
1 answer
1k views

Extracting mean value per layer for raster with terra package in R [closed]

I have a stack of monthly temperature raster data and would like to calculate the global spatial mean per area using the terra package in R to obtain a monthly time series. I tried terra::app and ...
LuleSa's user avatar
  • 25
0 votes
0 answers
30 views

CRS selection for global product with minimal area distortion

I am building a model that takes data from different sites around the world as input where each pixel has a 10m resolution. I am now seeking a CRS system that works best for my use case. The ...
cmosig's user avatar
  • 143
2 votes
1 answer
93 views

What is this "flag" marker in bottom right corner of altas? [closed]

A relative has a "Political map of the world" on the wall in their house. It has this "Flag" symbol in the bottom right corner. There are no other symbols like it on the map. What ...
EdL's user avatar
  • 128
0 votes
1 answer
74 views

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 ...
A. Bollans's user avatar
5 votes
2 answers
320 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 ...
Peter Krauss's user avatar
  • 2,304
0 votes
0 answers
1k 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 ...
Max Muller's user avatar
0 votes
0 answers
41 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 ...
Anne's user avatar
  • 1
1 vote
1 answer
90 views

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 ...
nmvfx's user avatar
  • 13
0 votes
1 answer
64 views

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?
0 votes
0 answers
508 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 ...
Kristina's user avatar
  • 1,073
7 votes
2 answers
985 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 ...
user112922341's user avatar
1 vote
0 answers
342 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 ...
Jio's user avatar
  • 652
0 votes
0 answers
98 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 ...
user avatar
0 votes
1 answer
47 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 ...
Nicole's user avatar
  • 19
1 vote
0 answers
605 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 ...
Jakob Simon-Gaarde's user avatar
4 votes
3 answers
3k 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 ...
Jwely's user avatar
  • 211
1 vote
0 answers
614 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 (...
Asw's user avatar
  • 31
0 votes
1 answer
91 views

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 ...
user116949's user avatar
1 vote
1 answer
109 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"...
Pavel Pereverzev's user avatar
2 votes
2 answers
207 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 ...
Mathematical Joe's user avatar
-1 votes
1 answer
167 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 ...
Amit Kohli's user avatar
1 vote
1 answer
229 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 ...
brandonn's user avatar
2 votes
1 answer
626 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 ...
flire's user avatar
  • 56
1 vote
0 answers
125 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)...
flixe's user avatar
  • 121
7 votes
3 answers
14k 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 ...
And G's user avatar
  • 121
2 votes
2 answers
635 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 ...
Nathan's user avatar
  • 21
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 ...
Kirk Kuykendall's user avatar
1 vote
2 answers
565 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 ...
uhoh's user avatar
  • 125
2 votes
2 answers
278 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 ...
Oliver Burdekin's user avatar
0 votes
0 answers
147 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....
RutgerH's user avatar
  • 3,335
1 vote
0 answers
57 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 ...
neelshiv's user avatar
  • 111
0 votes
2 answers
489 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 ...
Shreyas Chavan's user avatar
1 vote
3 answers
2k 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 ...
Jan-Pieter's user avatar
1 vote
2 answers
883 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 ...
Roman N's user avatar
  • 213
0 votes
1 answer
54 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?
Matt Sheehan's user avatar
3 votes
1 answer
208 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 ...
gct's user avatar
  • 132
2 votes
2 answers
4k 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 ...
Adam's user avatar
  • 121
1 vote
1 answer
656 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.)
priyank's user avatar
  • 11
6 votes
1 answer
875 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 ...
David Cary's user avatar
14 votes
2 answers
5k 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 ...
mmnoo's user avatar
  • 331
1 vote
0 answers
125 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 ...
utunga's user avatar
  • 883
52 votes
8 answers
89k 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/...