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).

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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.
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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 ...
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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 ...
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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?
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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 ...
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1 answer
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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 ...
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Oscillations in the variogram

I have created the following variogram. However, it can be seen that the values show a certain periodicity. Is this correct and where do these fluctuations come from?
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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? ...
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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 ...
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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 ...
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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 ...
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Identify and mask lakes

I have a question, I can mask out the oceans in the interpolation but not the lakes. Does anyone have an approach? I have taken the masking of the oceans from: https://www.earthinversion.com/...
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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 ...
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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 ...
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3 votes
1 answer
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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. ...
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1 answer
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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 ...
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1 answer
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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 ...
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7 votes
1 answer
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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 ...
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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 ...
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1 answer
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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 ...
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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. ...
2 votes
1 answer
149 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 ...
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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 ...
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1 answer
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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!
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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 ...
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2 votes
2 answers
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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 ...
2 votes
3 answers
148 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 ...
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1 answer
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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 ...
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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 ...
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4 votes
2 answers
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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 ...
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1 answer
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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 ...
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4 votes
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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 ...
3 votes
2 answers
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Resource for scientific maps?

I need an administrative division map of england for a motivation for some scientific workshop. I don't want to cite wikipedia for this. Sadly I can't find any official resources and I don't really ...
7 votes
3 answers
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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 ...
3 votes
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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 ...
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convert .srtm to xyz ord grd

I need to plot bathymetry map of my study region and need to convert the .srtm to .xyz or .grd format to use GMT. I tried to do this with grdraster and xyz2grd, but got wrong results. I found that ...
3 votes
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Coloring maps by feature orientation

I live in the SF Bay Area where many, but not all, geological features are oriented parallel to the San Andreas Fault. I was wondering if there’s a type of map where ridges are colored by compass ...
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What is the Offset Corner Latitude and Longtitude?

I tried to understand about Offset Corner Latitude Point 1,2,3,4 and Offset Corner Longitude Point 1,2,3,4. But I couldn't understand what is it? For example, I have the Frame center Latitude and ...
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5 votes
1 answer
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What is the chasm in the Arctic on Google satellite map?

In the image below, taken from Google Maps satellite view, between Svalbard and Greenland there is what looks like a massive crevasse, chasm, crack, &c. What is it? Should I be worried?
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1 answer
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Where are the magnetopheres weak points on Earth?

The picture below shows how a magnetosphere has defined points on the solid magnet and on the moon where cosmic radiation has a window, gap, or focal point. I'm not sure what to call these areas? ...
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10 votes
6 answers
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Can living where (rare) earth magnetic ore is abundant provide any protection from cosmic radiation?

Can living in a region that is rich in (rare) earth metal that has an inherently strong magnetic field provide any protection from cosmic radiation? Where are the strongest magnetic field other than ...
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2 votes
1 answer
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How would our weather change in the event of a magnetic pole shift?

Every two hundred thousand years or so the magnetic poles flip. Obviously it is not life ending but how would our weather change? How long does the transition take? Is there a map or model to show ...
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4 votes
1 answer
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Realtime planetary gravity maps?

I'm trying to find maps of realtime (or at least periodically updated / semi-realtime) gravity maps of Earth. I was hoping that GOCE might have something like this available, but I've been hitting a ...
26 votes
2 answers
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What is the line crossing the Pacific Ocean that is shown on maps?

The picture below shows an imaginary line on the globe which crosses the Pacific Ocean and works as a rough separator of the Eastern and Western hemispheres. What is this line called in English? I'm ...
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2 answers
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International Timing Zone

Why not make International Timing Zone just a straight line like this?
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Are there seamounts as close as 100 m to the water surface and not inside any Exclusive Economic Zone?

I did not find any seamounts as close as 100 m to the water surface (100m from the mean surface level at the location of the mountain) that are not part of any Exclusive Economic Zone (EEZ.) Do any ...
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4 votes
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Where on Earth does the wind only blow one way?

Is there a place on Earth that if the wind is blowing its only blowing (here is the twist) in the same direction from the ground to 53 km high?
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3 votes
1 answer
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Where on Earth is the highest none polar magnetic fields?

Is there anywhere that magnetic ore deposits are strong enough to have a magnetic field that would be stronger then Earths' magnetic poles by proximity? I'm not asking Where on Earth is the ...
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1 answer
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Where on Earth is the most windless lake with its own micro climate sea breeze?

Would a circular lake have enough of sea breeze strong to create a gentle vortex in the center of the lake? Is there such a place on Earth where lake micro climate vortexes occur frequently? The ...
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5 votes
1 answer
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Where on Earth has the least changing temperature? [closed]

Is there a map that shows places where the temperature changes the least season to season? Is there a place on Earth where the temperature is the most constant in a comfortable range?
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