Topic: Some map-making questions. (Read 1774 times)

_AUS_Salmo · « **on:** January 18, 2011, 01:16:37 AM »

Apologies for posting mapping questions in the lounge. I don't have posting rights in the mapworkx forums. I've built some simple maps previously by following KevinP's (& others) tutorials. Now I'm embarking on a larger project & have encountered some new issues.

1. What is the best way to fill DEM holes/poor STRM data in microdem?
My map has many areas that are poorly satelite mapped (see pic below), such that there are areas that appear very block-like, mostly around coastal areas & small island chains. I've tried STRM-30 hole-fill but this does not seem to correct any of the poorly mapped areas.

2. How to map water bodies?
There are many areas of low lying water/lakes as well as oceans/rivers. I've tried using the "lake check" & "ocean check" tick boxes as I do altitude adjustments. Is this the way to go? The lake areas show up blue on the color map, but how do I proceed from there?

3. Half-Scaling the map?
The map is rather large, and I've chosen to scale each individual DEM grid then stitch them together hoping this will provide greater resolution/accuracy. Instead of pixel size of 50 I should use pixel size of 100, right?

farang65 · « **Reply #1 on:** January 19, 2011, 10:53:34 PM »

Hi Salmo,

Nice to see your getting in to maps.

I'll post a link for you soon regarding lakes and rivers in Microdem.

I've always made lakes and river in Miicrodem some rivers need to be detailed in map_c from the initial map_c in Microdem.

I make a map_c,ed _map map_h and map_t all in Microdem.

Scaling can be useful especially if you do have a large area.

Example I tried Cuba,Jamaic,and Haiti with 75 pixels and 100 pixels (out of memory) came up.
200 pixals went in smoothly.

Sometimes a scaled map helps in regards to shorter distance flying times.

Seriously who wants to fly over and endless ocean for 90 minutes before you reach the target.

Will ad a link for you tonight

Cheers Kirby

ps I've only encountered missing data with oceans and that's easy to do in Microdem

farang65 · « **Reply #2 on:** January 20, 2011, 02:43:30 AM »

For Salmo,

A Microdem Tutorial for creating map_c map_h and map_t in Microdem.

Map_c section is very interesting as it includes lakes and rivers.
Microdem back up files 16rgb value terrian texture file from clock watcher, elevation file and a 5 rgb
value terrian texture file from KevinP

https://www.mediafire.com/?69ocl9wavcjja

A better site for map data covers much more of the Earth then the SRTM DATA site

http://www.gdem.aster.ersdac.or.jp/

You have to join and become a member.

Cheers Kirby

_AUS_Salmo · « **Reply #3 on:** January 20, 2011, 03:28:58 AM »

Thanks mate. Got my map files done, but unfortunately I get a terain load error in FMB. Doesn't seem to be a texture incompatibility though. I'll read the info provided & give it another go over the weekend.

Author Topic: Some map-making questions. (Read 1774 times)

_AUS_Salmo

Some map-making questions.

farang65

Re: Some map-making questions.

farang65

Re: Some map-making questions.

_AUS_Salmo

Re: Some map-making questions.