19 votes
Accepted

How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

I think you are too into the numbers. When talking about longitude and latitude they are two different things. Longitude goes east and west from a point on the earth from 0 to 180 degrees east and ...
Jason Goemaat's user avatar
17 votes
Accepted

Are there seamounts as close as 100 m to the water surface and not inside any Exclusive Economic Zone?

Yes, there are many. According to the seafloor topographic data of ETOPO (1 arc second resolution), and the Exclusive Economic Zones (EEZ) database of marineregions.org. There are at least 157 ...
Camilo Rada's user avatar
  • 17.6k
13 votes

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

Yes. Every equal-area map displays all countries (and other areas) in their correct relative size. Inevitably, they don't show the correct shape (unless you're looking at a globe). Personally, my ...
gerrit's user avatar
  • 11.7k
13 votes

Are there seamounts as close as 100 m to the water surface and not inside any Exclusive Economic Zone?

Checking the Wikipedia page on underwater volcanoes and listing them by height, I think the best candidate is Vema Seamount. Vema Seamount is in international waters and its shallowest point is at 11 ...
arkaia's user avatar
  • 15.4k
8 votes
Accepted

How much of Earth's land area has antipodal land area?

A rough idea, using the Lambert Conformal image at the Cartopy projection list and Gimp: The gold area should be the overlap. So basically parts of South America with Indonesia and SE Asia... and ...
JeopardyTempest's user avatar
7 votes
Accepted

Old topographic maps of Odisha, India

The PCL Map Collection (University of Texas at Austin) is a huge online collection of maps. For India, they have a series from the U.S. Army Map Service which might be of interest, as it dates from ...
Jean-Marie Prival's user avatar
7 votes
Accepted

Is there a better system than latitudes and longitudes?

To answer the question in the title (with another question): better for what? To answer the questions in the body: there is another system called rectilinear or x-y-z Cartesian coordinates. This ...
kingledion's user avatar
  • 3,376
6 votes

Elevation of a point on Earth

There are many reasons. First, measuring from sea level is traditional. It started before we had an accurate way of measuring distance from the center of the Earth, and probably before most people ...
jamesqf's user avatar
  • 1,748
6 votes

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

This is pretty straight forward. The traditional map is very good for longitude and latitude. It's pretty lousy for the shapes and sizes of the continents cause everything close to the poles is ...
userLTK's user avatar
  • 5,847
5 votes

How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

There is a site that will show you the antipode for any location, and takes you through the calculation if you need it - https://www.geodatos.net/en/antipodes/united-states/monterey. Looking at the ...
Andy M's user avatar
  • 2,008
5 votes

Why is the north considered as up, and south as down?

Most of our geographic and astronomic terms were developed in pre-history in the northern hemisphere. Even early astronomers noticed that Polaris, the north star, was 'up' in the night sky, so north ...
Gordon Stanger's user avatar
4 votes

Why is the north considered as up, and south as down?

There is no good reason. It's simply a convention that someone started a long time ago and that stuck. Like the question whether an hour is divided into 60 minutes and a minute into 60 seconds. If ...
Wolfgang Bangerth's user avatar
4 votes
Accepted

GIMMS NDVI3g grid cells not entirely square-shaped?

Your understanding is inaccurate. The shifts by $\frac{1^\circ}{24}$ are only relevant for figuring out, where the pixel centers are located and where to start when you are looking to find the right ...
Christoph's user avatar
  • 994
3 votes

How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

You can travel in north-south direction to go around the world... but you can also travel east-west. Going around the equator halfway will see no north-south change, but still be halfway around the ...
JeopardyTempest's user avatar
3 votes

How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

It all depends on exactly what you mean by "halfway around the earth heading due north or south." One theoretical interpretation of that phrase is that, starting in Monterey, California, you ...
Tanner Swett's user avatar
3 votes

Complete missing outcrop problem

First step - draw a strike line where line A intersects the 400 m line. Second step - you know that the sandstone layer is of equal thickness and dip, so you can draw a parallel line at the place with ...
Gimelist's user avatar
  • 23.1k
3 votes

How can smartphones help geologists in the field?

Part of the answer lies in where the geologist will be working and if there will be coverage by cellular/mobile telephone networks. It is my experience that a number of geologists, particularly ...
Fred's user avatar
  • 24.7k
3 votes

Great circle in UTM coordinates

The UTM coordinate system, is a kind of Transverse Mercator projection separated in longitude bands and restricted in latitud extent such that the distortions associated with the projection remain ...
Camilo Rada's user avatar
  • 17.6k
3 votes

Is there a better system than latitudes and longitudes?

The other answers are correct on the subjectivity of "better." They are also right, in that the answer you may get will depend on your application. My answer is yes and no. Yes: There is a way to ...
BarocliniCplusplus's user avatar
3 votes

Is there a better system than latitudes and longitudes?

Better is first and foremost opinion based so cannot be answered with a conical answer, but, will give it a stab anyway. First, it is entirely dependent on application. Start with your suggestion of ...
dlb's user avatar
  • 626
3 votes

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

Found in https://twitter.com/amazingmap I can't personally vouch for accuracy. From tweet, several complaints about Antarctica, "wrong pole", etc. New favourite map projection. Hellereal Boreal ...
uhoh's user avatar
  • 7,096
3 votes
Accepted

How can smartphones help geologists in the field?

I know a young geologist using his smartphone as a compass. When we were in the field doing structural measurements together, I would: Record a waypoint using my hiking GPS Take the measurement with ...
Jean-Marie Prival's user avatar
2 votes

Is there a name for the process of producing positional data for cartography?

Surveying is the process of taking topographical measurements of latitude, longitude and elevation. It is also the process of marking out lines for engineering/construction designs of such things as ...
Fred's user avatar
  • 24.7k
2 votes

How can a starting point south of the north pole to an endpoint north of the south pole be halfway around the world?

It's easy to get confused by great circle distances when looking at a flat map. I find it much easier to understand the concept while looking at a globe, or if I don't have any, on Google Earth. The ...
Eric Duminil's user avatar
2 votes

Elevation of a point on Earth

Why can't we just take Earth's centre as the reference point for finding the height of any location? While there are many uses for Earth-centered, Earth-fixed coordinates, they're not particularly ...
David Hammen's user avatar
  • 23.5k
1 vote
Accepted

Is sterescope still used to do cartography with orthophotography?

I am working in an academic environment and I know these tools are still shown to undergrads along other modern photo-interpretation techniques. Often, modern techniques are more straightforward and ...
marsisalie's user avatar
  • 2,673
1 vote

How much distance does $0.001^\circ$ in latitude or longitude represent?

I am using "PARI" a free open source math program for Mac or PC, for these exact (vs GRS80 Ellipsoid) equations: "longscale"gives meters per (second of Longitude) at a constant ...
fischertranscripts's user avatar
1 vote

What is the maximum value of Easting in UTM coordinates?

The circumference of the Earth at the equator is ~40,075km. Given that each UTM Zone is 6 degrees spaced in Longitude, there are then 60 UTM Zones around the globe. Each Zone is thus 40,075/60 or ~...
Peter Murrell's user avatar

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