Skip to main content

Questions tagged [mapping]

The process of translating spatially organized knowledge of an area or place into a geographic medium. Can include the production of physical/paper maps and atlases, geocoded data, or interactive virtual maps produced using Geographic Information Systems (GIS).

Filter by
Sorted by
Tagged with
3 votes
1 answer
126 views

What is the best way to interpolate isotopic data and display them?

I want to interpolate isotope data of precipitation and display it on a map. The data are available as a CSV file. ...
0 votes
1 answer
31 views

Crustal magnetic field of the Earth

Where can I find an accurate map of the Earth's crustal magnetic field?
2 votes
1 answer
67 views

How to define sea areas

I want to define different study areas and want to do this here, for example, using the Nordic Seas. According to the definition, this area lies north of Iceland and south of Svalbard. However, are ...
0 votes
0 answers
24 views

How can a tidal height be lower than 'Chart Datum'/'LAT' e.g 'Lowest Astronomical Tide'?

We just had a very low low tide in the UK, an equinoctial tide on the 12th of March that was calculated as -0.13m above chart datum, i.e 13cm below the 'Lowest Astronomical Tide'. Check here for tidal ...
7 votes
3 answers
32k views

At what depth does the underground begin to warm up?

Spring water comes out colder from being underground. But if you get deeper the temperature goes up. At what depth does the underground stop getting colder and begins getting warmer? Is there a map ...
2 votes
2 answers
121 views

map projections that minimises differences

I have an odd map projection requirement, but I would like a world map projection where even very small countries, like Luxembourg or Belgium are still visible when also showing China and Canada on ...
6 votes
1 answer
563 views

What kind of projection is that?

I found this figure in the paper: Atlantic overturning: new observations and challenges by Srokosz et al. I wonder what kind of projection this is and what the advantages of it are? It looks to me as ...
0 votes
0 answers
41 views

How to I change polar projection to equirectangular?

Specifically these maps. https://imgur.com/a/Pvpm2Zy#dpWSjah The image and mapping apps I have can't do want I want with the techniques I know, on the map like this. But If I could convert it to ...
2 votes
1 answer
37 views

Map showing monthly or weekly average low temperatures in Turkey and Iran

I am hoping to walk from Trabzon to Astara during October and November. I am hoping to take the route that will have the highest "average low" temperature across this period, to make camping ...
0 votes
0 answers
84 views

What does the value 254 mean on this map?

NASA has a land cover map that tells you what type of biome is on the Earth's surface: here There are 17 different land types. If you download one of the two tiffs here and zoom into a couple of ...
3 votes
0 answers
197 views

Investigating the "Leesburg split" rainfall anomaly

I've spent some time in the Leesburg, Virginia (USA) area and I've noticed that whenever a line of thunderstorms approaches the area, it frequently splits and goes around a particular spot just ...
2 votes
1 answer
123 views

How to find out if three points on Earth are on the same great circle arc?

I am trying to figure out whether 3 particular points on Earth's surface are on the same arc (of a great circle) or not. Using Google Earth's (also ArcGIS Earth's) line tool, I see that the points are ...
1 vote
0 answers
33 views

Temperature Data Software

I'm looking to create a map of the U.S. that depicts mean winter and summer temperatures. Is there a software suitable for this? I found CSVs of data here: https://www.ncei.noaa.gov/data/normals-daily/...
1 vote
0 answers
23 views

Hemispheres with some property

You surely know the "water hemisphere" of Earth. Have other hemispheres been computed? (For example, Wiki notes "population hemisphere" coincides more or less with the "land ...
2 votes
0 answers
38 views

Difference between Hillshading and Terrain Resource Information Management

I am picking up on remote sensing. I came across a paper where they use the shaded relief model from Terrain Resource Information Management (TRIM) for hillshading. However, is it the same as the ...
2 votes
0 answers
65 views

Form Lines from Strike and Dip measurements

I am looking to draw form lines on this map based on the strike and dip measurements taken on site. From what I have gathered it is an anticline with a possible second fault to the right hand side. ...
0 votes
0 answers
61 views

Map showing the typical rainfall paths

Hello I am looking for a map that shows the typical (typical for the last 50 years) precipitation paths in the Northern Hemisphere! I already know this map, but it only shows a momentary event and ...
0 votes
0 answers
43 views

Map showing the change in precipitation intensity

Hi I need a map for the North American region that shows the change in rainfall intensity. Unfortunately, I can only find maps like this map Unfortunately, these are not detailed to use.
3 votes
0 answers
51 views

How is drainage divide defined upstream of bifurcation?

Recently, I visited the Divide Creek birfucation in Canada where a creek bifurcates with one arm flowing to Pacific and the other to Arctic Ocean and I was wondering how does this rather rare ...
2 votes
1 answer
3k views

How to determine ocean bottom depth for a data set consisting of longitude and latitude?

Given a data set which consists of pairs of longitudes and latitudes, is it possible to determine an estimate of the ocean bottom depth at that point? I can find maps of estimated sea depths online (...
1 vote
1 answer
285 views

What are negative latitudes?

In this image from the Wikipedia ozone layer page there are positive (normal) and negative latitudes on the bottom axis: Are the negative latitudes those north or those south of the equator?
2 votes
1 answer
83 views

Where can I find geological maps for countries from Africa?

I am interested in geological maps for multiple African countries: Egypt, Sudan, and Ivory Coast. Is there any geoportal available for Africa, something similar to geokniga or vsegei, but for Arican ...
6 votes
1 answer
222 views

Geotiff for Elevation Data or NetCDF

I need elevation data with lat and long for a project worldwide. By intuition I would say that a GeoTiff would be suitable, e.g. the one from https://asterweb.jpl.nasa.gov/gdem.asp. Are there better ...
0 votes
0 answers
87 views

Algorithm for the interpolation?

I have managed to plot various points on a map and interpolate with ordinary kriging. However, my data does not look anything like it should. Do I need to use an algorithm to fill in the missing data? ...
2 votes
0 answers
31 views

Which variogram method for ordinary kriging?

I want to plot atmospheric data (2H and 18O) on a map and use ordinary kriging for the interpolation. Now I have the question how to quantify which variogram method (Gaussian, exponential spherical) I ...
1 vote
0 answers
513 views

How to plot quiver (current/wind arrows) plot on a basemap

and thank you for answering I am trying to plot a quiver plot on a basemap (The basemap has to be a good quality map such as openstreetmap) and I can't find a way to do it. There are some examples on ...
0 votes
0 answers
39 views

Isotope fractionations

The isotopic fractionations in the precipitate are equilibrium fractionations and the evolution of a system can be described using Rayleigh destillation! The fractionation type during evaporation is ...
1 vote
0 answers
28 views

Data for Isoscape

I am in the process of creating an isoscape for the stable isotopes in precipitation (2H and 18O). Does anyone know of any other databases besides GNIP (IAEA) that have further entries (especially ...
1 vote
0 answers
51 views

Complex interpolation for Isotopic data

I have another question, is there a package that interpolates precipitation data taking into account mountains and oceans? I have so far used Numpy and Basemap but as you can see in the code, the data ...
3 votes
0 answers
997 views

Crustal age global map

I've been searching for a map depicting the age of each part of the crust for a long time. I'm not a geologist but I'm a physicist so I would like to know about the most up-to-date and accurate ...
2 votes
1 answer
95 views

Folium/Leaflet tiles for air pollution modelling

I am using land use regression with machine learning to create an air pollution model. However, almost all tiles I can find using Python and Folium contain text, which my intuition says cannot ...
1 vote
1 answer
740 views

In Geology - True Dip versus Apparent Dip: When dip is estimated along a line of section, how is that dip determined in relation to true dip?

The map presents a summary example of topography and mapped units X and Y. From the information presented, can someone help me determine or estimate the actual dip along the line of section, A-A'? I ...
7 votes
1 answer
343 views

What are these clearings in Amazon rainforest?

I was surfing around on Google Maps and found dozens of clearings amid a sea of vegetation. What are they? Some look like rocks, others can't be made out due to the image resolution. Here is one ...
3 votes
1 answer
218 views

What are these radial line patterns shown in representations of antarctica?

In the video of the recent Iridium-6/GRACE-FO launch at about T+ 33:00 (curently at 49:00 in the video) the 2nd stage passes ...
1 vote
1 answer
41 views

Source for USGS (probably not) seismic map of La Habra, California (Publication Date April 15, 1998)

I'm trying to find to original source (especially high quality version) of this conservation seismic map. I know that it probably came from USGS (or not) but looks like it out of print? I tried to ...
7 votes
1 answer
285 views

Software for spatial interpolation of temperature and relative humidity data from weather stations

I'm working with time series of weather data (specifically, min/max daily temperatures and relative humidity) recorded from weather stations over an area of about 200,000 km2. I would be interested in ...
6 votes
1 answer
369 views

Is there a global map of wind design loads or wind gust climatology?

I'm looking for a world map of wind gust climatology data, with the specific purpose of being used for coarse comparison of building design loads, with a consistent metric regardless of location. ...
6 votes
1 answer
279 views

Old topographic maps of Odisha, India

For my research related to coastal Odisha, India I am mapping the coastal boundary. I have downloaded available Landsat images which date back to 1972. But I want to map the same for before 1972. I am ...
3 votes
1 answer
217 views

Complete missing outcrop problem

Given A is upper limit of sand stone, B is the lower limit of the planes that are equal in distance and dip. Dip angle is 29 degrees. Complete the outcrop of this map. —————————————————————————- Now I ...
2 votes
0 answers
32 views

Literature on thematic 4D maps

I need to understand more about thematic 4D mapping. I would roughly classify it as a method of cartography. In particular I want to do research on what software is being used to create thematic 4D ...
7 votes
3 answers
329 views

Has Antarctica's coastline been completely mapped? (map discrepancies)

Looking at different world maps, I noticed that there is considerable variety in how the coastline of Antarctica is depicted (even when taking the different map projections into consideration). Are ...
2 votes
1 answer
240 views

Does anyone have a geological map 1 / 1 000 000 or 1 / 50k of Morocco in HD?

I am having a problem reading in my low version map. Besides, any tips on where I can find "free" maps? Thank you!
2 votes
2 answers
104 views

Would ultrasound be a valid method of mapping ocean floors given the perceived "gel" is ocean water?

I am a scuba diver, with a big idea that would require me to map various dive sites as I went to them and dove in them. The typical size and other implications of sonar technology would essentially ...
1 vote
3 answers
206 views

How do we know the Arctic is just ice?

If I look at an Earth's map, the Arctic/North Pole always appears just like water. Evidently this is actually covered by ice, with an area depending on the time of the year. If this area is bigger ...
1 vote
1 answer
75 views

How do you infer what a cross section might look like below sea level?

Here is a schematic of a cross section which should represent an anticline: https://postimg.cc/4HcmmZ26 Below sea level, I have inferred what the units might look like with the dashed lines. As I have ...
1 vote
1 answer
70 views

What is the best way to split strike and dip data on the image provided into "domains" in order to interpret folding on a stereonet?

Link to the original image: https://postimg.cc/v4bRqxxR I believe this image represents two folds which are overturned and plunging. I would like to analyse these folds on a stereonet, but I am unsure ...
4 votes
2 answers
190 views

Does the position of the Earth's axis affect the position and shape of its continents?

If somehow we were to move the Earth's axis of rotation to, say, Mexico, making some spot in Mexico effectively the North Pole, would this change how the continental plates drift over time, thereby ...
1 vote
1 answer
317 views

Identifying thrust faults on a geologic map

I am not able to upload the map as the file is too large, but I have a map which states there is an over thrust fault. It has two ticks on it indicating downthrow to the NE. The downthrow is pointing ...
4 votes
0 answers
165 views

How would one go about drawing the contour lines for this map in order to draw the cross section?

Good Day. We Received this map as practice for our Geology university module and I have no idea how to draw the strike lines where the different heights intersect the different rock types in order to ...
8 votes
3 answers
5k views

Is there a map that displays every country at its correct relative size?

I know that the standard Mercator projection is completely wrong when it comes to the relative sizes of countries (Greenland appears relatively much larger than in reality, for example). AFAIK they do ...