Hfrhyu

What does "Its cash flow is deeply negative" mean?

Why do professional authors make "consistency" mistakes? And how to avoid them?

Is it my responsibility to learn a new technology in my own time my employer wants to implement?

The King's new dress

Text adventure game code

What is meant by a M next to a roman numeral?

How do I solve this limit?

Would this house-rule that treats advantage as a +1 to the roll instead (and disadvantage as -1) and allows them to stack be balanced?

How do I construct this japanese bowl?

Too much space between section and text in a twocolumn document

Why here is plural "We went to the movies last night."

What can we do to stop prior company from asking us questions?

Was a professor correct to chastise me for writing "Prof. X" rather than "Professor X"?

How to safely derail a train during transit?

Are there languages with no euphemisms?

How do scammers retract money, while you can’t?

Solution of this Diophantine Equation

When did Lisp start using symbols for arithmetic?

What happens if you roll doubles 3 times then land on "Go to jail?"

Why does GHC infer a monomorphic type here, even with MonomorphismRestriction disabled?

Does it take more energy to get to Venus or to Mars?

Anatomically Correct Mesopelagic Aves

Is it okay to store user locations?

How do I go from 300 unfinished/half written blog posts, to published posts?

Creating a custom datum transform to convert from sphere to spheroid using ArcMap?

1

I have Lat/Lon data that is for a sphere, but I am trying to convert these points to an oblate spheroid. Currently the sphere-based data points are offset when projected onto a map that is based on the spheroid geographic coordinate system. I believe this requires a custom datum transform, but it is not included in ArcMap and I have to specify the transform.

Any idea on how to convert latitudes used on a sphere-based geographic coordinate system to one for an oblate spheroid?

The spheroids are for Mars. One is a sphere with radius 3396190, and one is a spheroid with equatorial radius 3396190 and polar radius 3376200. It requires a custom datum transform, but I am unsure how to define such a custom transform. How is this done?

coordinate-system arcmap

share|improve this question

edited yesterday

ricitron

asked 2 days ago

ricitronricitron

63

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Please Edit the question to specify which sphere, and which spheroid, and give an indication of the accuracy of the collected values, and the envelope of the collected values.
  
  – Vince
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Done, thank you. It is both custom spheroids: one a sphere radius 3396190, and one a spheroid with equatorial radius 3396190 and polar radius 3376200.
  
  – ricitron
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The 3396190 sphere is actually defined by the Mars 2000 datum. You'd need to use a custom datum and custom transformation to get to the other. @mkennedy is the keeper of the keys to the realm of transformations with Esri products.
  
  – Vince
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @Vince , I have updated the question. Yes, I am curious how to construct a custom datum transform from a Mars sphere to a spheroid, or alternatively from the Mars2000 oblate spheroid to the Mars200 sphere.
  
  – ricitron
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is the offset entire north-south? If so, try this. In ArcMap, add both datasets. Open data frame properties, coordinate system tab, click transformations, then new transformation. Set the input/output gcs to the 2 gcs. Method to geocentric translation. Leave the parameters set to zeroes. If this works, I'll write it up as an answer.
  
  – mkennedy
  13 hours ago
  

  
  
  
  

 | 
show 1 more comment

1

I have Lat/Lon data that is for a sphere, but I am trying to convert these points to an oblate spheroid. Currently the sphere-based data points are offset when projected onto a map that is based on the spheroid geographic coordinate system. I believe this requires a custom datum transform, but it is not included in ArcMap and I have to specify the transform.

Any idea on how to convert latitudes used on a sphere-based geographic coordinate system to one for an oblate spheroid?

The spheroids are for Mars. One is a sphere with radius 3396190, and one is a spheroid with equatorial radius 3396190 and polar radius 3376200. It requires a custom datum transform, but I am unsure how to define such a custom transform. How is this done?

coordinate-system arcmap

share|improve this question

edited yesterday

ricitron

asked 2 days ago

ricitronricitron

63

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Please Edit the question to specify which sphere, and which spheroid, and give an indication of the accuracy of the collected values, and the envelope of the collected values.
  
  – Vince
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Done, thank you. It is both custom spheroids: one a sphere radius 3396190, and one a spheroid with equatorial radius 3396190 and polar radius 3376200.
  
  – ricitron
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The 3396190 sphere is actually defined by the Mars 2000 datum. You'd need to use a custom datum and custom transformation to get to the other. @mkennedy is the keeper of the keys to the realm of transformations with Esri products.
  
  – Vince
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @Vince , I have updated the question. Yes, I am curious how to construct a custom datum transform from a Mars sphere to a spheroid, or alternatively from the Mars2000 oblate spheroid to the Mars200 sphere.
  
  – ricitron
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is the offset entire north-south? If so, try this. In ArcMap, add both datasets. Open data frame properties, coordinate system tab, click transformations, then new transformation. Set the input/output gcs to the 2 gcs. Method to geocentric translation. Leave the parameters set to zeroes. If this works, I'll write it up as an answer.
  
  – mkennedy
  13 hours ago
  

  
  
  
  

 | 
show 1 more comment

I have Lat/Lon data that is for a sphere, but I am trying to convert these points to an oblate spheroid. Currently the sphere-based data points are offset when projected onto a map that is based on the spheroid geographic coordinate system. I believe this requires a custom datum transform, but it is not included in ArcMap and I have to specify the transform.

Any idea on how to convert latitudes used on a sphere-based geographic coordinate system to one for an oblate spheroid?

The spheroids are for Mars. One is a sphere with radius 3396190, and one is a spheroid with equatorial radius 3396190 and polar radius 3376200. It requires a custom datum transform, but I am unsure how to define such a custom transform. How is this done?

coordinate-system arcmap

share|improve this question

edited yesterday

ricitron

asked 2 days ago

ricitronricitron

63

share|improve this question

edited yesterday

ricitron

asked 2 days ago

ricitronricitron

63

share|improve this question

edited yesterday

ricitron

asked 2 days ago

ricitronricitron

63

asked 2 days ago

ricitronricitron

63

asked 2 days ago

ricitronricitron

63