Overall, a nice intro. Clean graphics and an accessible presentation. That said, I offer that a geoid model is not a snooth mathematical model (like an ellipsoid is), but one derived from measures of gravity. Also, the 'NA' in NAD83 does not indicate North America, but the North American tectonic plate. You might not need to cover NAD83(1992) vs. NAD83(2011) in an intro course, but it's worth planting the seed that ongoing plate movements do prompt periodic updates to our spatial reference systems.
+Scott Drzyzga Thanks so much for these thoughts! Keep them coming. I'm continually updating material. Thanks for taking the time to respond. Cheers, Ben
+Scott Drzyzga -- thanks again for this comment, I went through a closer inspection. I especially appreciate the clarification about NAD 83. I will have to update that in future videos. As for the geoid, I think you'll find that I do describe it as a geophysical approximation based on the gravitational field. At -1:14- I mention the ellipsoid as being the "smooth mathematical model" for creating a geographic grid. I would welcome any comments you have about terminology and presentation on any other videos I have, I'm working on creating more that describe the process of selecting proper projections. Thanks so much for taking the time to respond! Comments and critiques are always helpful. Cheers, Ben
Good stuff. Keep making videos, but perhaps get a better mic. You can get them cheap at a pawn shop, along with a cheap interface for like less then 100 bucks bro!
Gyar.. that dang schwa sound and putting the wrong stress on the wrong syll-ah-ble. Thanks though Ben! I'll update that in the future. Must have heard it pronounced wrong or only ever read it.
Very good video. Clear and clean explanations. Great usage of mouse to point to images along with useful commentaries. Thank-you so much!!
Overall, a nice intro. Clean graphics and an accessible presentation.
That said, I offer that a geoid model is not a snooth mathematical model (like an ellipsoid is), but one derived from measures of gravity. Also, the 'NA' in NAD83 does not indicate North America, but the North American tectonic plate. You might not need to cover NAD83(1992) vs. NAD83(2011) in an intro course, but it's worth planting the seed that ongoing plate movements do prompt periodic updates to our spatial reference systems.
+Scott Drzyzga Thanks so much for these thoughts! Keep them coming. I'm continually updating material. Thanks for taking the time to respond. Cheers, Ben
+Scott Drzyzga -- thanks again for this comment, I went through a closer inspection. I especially appreciate the clarification about NAD 83. I will have to update that in future videos.
As for the geoid, I think you'll find that I do describe it as a geophysical approximation based on the gravitational field. At -1:14- I mention the ellipsoid as being the "smooth mathematical model" for creating a geographic grid.
I would welcome any comments you have about terminology and presentation on any other videos I have, I'm working on creating more that describe the process of selecting proper projections.
Thanks so much for taking the time to respond! Comments and critiques are always helpful.
Cheers,
Ben
Wow - you explained these complicated concepts so well. Thank you!! (regards from India)
This video helped me wrap my head around these ideas a little better. Thanks a bunch! I'm thinking I'll be coming back to your channel often!
Thank you for summarizing 4years of survey engineering college ha. Good work friend.
Well explained, pleasant way of talking. Thanks for the video!
Thank you! This explanation really helps me to understand the different models of the Earth
Thanks Ben! Yeah, I think I haven't heard it pronounced that much (mostly read) since college. Someday I'll get around to changing that. Cheers.
Good job. Easy to understand
Thank you, sir, for this video. It is fruitful to me.
Excellent video! Keep on the good work!
Thanks! Glad it helped, and thanks for subscribing!
great explanation
Great video, examples, explanations. Thanks!
Amazing video!
Beautiful.
amazing greaaat work !!
Excellent
Solid video!
Can you help me understand the difference between Earth Gravitational Model 1996 and INDGEOID and how regional GM models are derived?
Very helpful. Thank you
This is genius.
I was lost until I found you.
"don't get too bent out of shape just yet" hardy har har
Good stuff. Keep making videos, but perhaps get a better mic. You can get them cheap at a pawn shop, along with a cheap interface for like less then 100 bucks bro!
Great
Why we need to fit ellipsoid to geoid?
Do you mean ellipsiod is necessary for any projection?
ge-odd-uh-see, not geo-deh-see ;P great video though!
Ben Patton Exactly, I was in the Geodetic Survey Squadron.
Gyar.. that dang schwa sound and putting the wrong stress on the wrong syll-ah-ble. Thanks though Ben! I'll update that in the future. Must have heard it pronounced wrong or only ever read it.