2019 South Jersey LIDAR

Boyd

Administrator
Site Administrator
Jul 31, 2004
8,070
1,775
Ben's Branch, Stephen Creek
Nothing impervious there Al, just another example of hydro flattening. When the imagery is processed they use the boundaries of the waterbody (not sure of the source) and set the elevation of everything inside to the mean elevation of the water. In this case, that island obviously wasn't included in their data. Maybe it was an oversight or was just too small?

I used 2012 landcover data for the waterbodies in my 2020 map and that island is shown.

https://online.boydsmaps.com/#17/39.43177/-75.06823/pines2020

It is not on any of the Lidar imagery but yet I have stood on it.

Note quite true, it shows on my new LIDAR 2021 HD map which uses that same waterbody data. :D

https://mobile.boydsmaps.com/#17.00/39.431770/-75.068230/lidar2021hd/0.00/0.00

But the green color of the island is actually the flat surface of the water, so technically, it doesn't show on the LIDAR. You can also see where my waterbody data doesn't quite match the LIDAR in the islands/shoreline north of there too.
 
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manumuskin

Piney
Jul 20, 2003
8,069
1,932
57
millville nj
www.youtube.com
Nothing impervious there Al, just another example of hydro flattening. When the imagery is processed they use the boundaries of the waterbody (not sure of the source) and set the elevation of everything inside to the mean elevation of the water. In this case, that island obviously wasn't included in their data. Maybe it was an oversight or was just too small?

I used 2012 landcover data for the waterbodies in my 2020 map and that island is shown.

https://online.boydsmaps.com/#17/39.43177/-75.06823/pines2020



Note quite true, it shows on my new LIDAR 2021 HD map which uses that same waterbody data. :D

https://mobile.boydsmaps.com/#17.00/39.431770/-75.068230/lidar2021hd/0.00/0.00

But the green color of the island is actually the flat surface of the water, so technically, it doesn't show on the LIDAR. You can also see where my waterbody data doesn't quite match the LIDAR in the islands/shoreline north of there too.
That island is all of three ft above lake level in the center and so thick you can barely get onto it.You can actually walk across the top of the lake from there across Old Colonial Dam which is the original dam in the lake from the 1700's.In the summer a rim of grass grows on the dam and it can be seen thta way but in winter you don't see it till your floating across it.It;s maybe four or five inches below water and the two spill ways at each end are several ft deep.The one near the is;land being deeper at about chest deep.
 
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