Author Topic: Map making tools and info location (Read 3054 times)

Ghastly · « **Reply #30 on:** August 05, 2007, 08:01:05 AM »

Nope, one area where Corel definately lags PS is in the ability to work with Raw files. Instead of being incorporated into the application, they give you a seperate application to convert them - and instead of determining/parsing/prompting for the file format, they support Raw import by camera model only.

Since I couldn't find a camera model that writes out 16 bit signed integer in MSB first format (and why would one?) , I was out of luck.

Gimp has a built in scripting language that I could probably implement one in, but it would take more time than just writing it in one of the languages I know.

It's only about 2 hours work - but I've only had an hour to spend on it. Besides, once I'm done I'll be able to use it for other file types by just changing the import routine.

~~Guy~~

Dux · « **Reply #31 on:** August 05, 2007, 12:53:48 PM »

NHawk, I'm only really familiar with DTED files... but do DEM files also change size once they go above 50-deg Lat?

DTEDs become half the size horizontally.

Easyscor · « **Reply #32 on:** August 05, 2007, 02:14:33 PM »

DEM files continue to be at 30 seconds all the way to the pole, giving more data points per mile in the east west direction however DTED files have more reliable elevation data because they’ve been updated more recently. The best results depend on the area of the world.

Easyscor · « **Reply #33 on:** August 05, 2007, 02:17:25 PM »

Ghastly you might want to be aware that elevation data 0x1A may cause you some problems with file read errors. Your mileage may vary.

Ghastly · « **Reply #34 on:** August 06, 2007, 12:37:36 AM »

Hmmm... I'll bear that in mind Easycor! Thanks - I don't know how long it would have taken to resolve a troublesome terrain down to that as a culprit...

And I've emailed it out to MidDog, if anyone else needs or wants it.

NHawk · « **Reply #35 on:** August 06, 2007, 05:32:18 AM »

Quote

Originally posted by Easyscor
DEM files continue to be at 30 seconds all the way to the pole, giving more data points per mile in the east west direction however DTED files have more reliable elevation data because they’ve been updated more recently. The best results depend on the area of the world.

This is more or less correct. Here is the chart for distances covered at different latitudes.

Latitude Ground distance (meters)
(degrees) E/W N/S
--------- ------------
Equator 928 921
10 914 922
20 872 923
30 804 924
40 712 925
50 598 927
60 465 929
70 318 930
73 272 930
78 193 930
82 130 931

Keep in mind that the GTOPO is not an actual satellite scan. It is a computer generated elevation model compiled from different data sources......

DTED 30 18 product specification
DCW 160 97 calculated vs. DTED
USGS DEM 30 18 product specification
AMS maps 250 152 estimated from 500-meter interval
IMW maps 50 30 estimated from 100-meter interval
Peru map 500 304 estimated from 1,000-meter interval
N.Z. DEM 15 9 estimated from 100-foot interval
ADD highly variable wide range of scales and intervals

Hence why better detail can be obtained depending on the area of the world you use.

Easyscor · « **Reply #36 on:** August 06, 2007, 11:28:03 AM »

NHawk the eyes on some of these guys glazed over and smoke started pouring from their ears after the first line, but yes.

mrmidi · « **Reply #37 on:** August 12, 2007, 01:22:10 AM »

Added the working Delta files to the website...

Mid

croduh · « **Reply #38 on:** August 12, 2007, 02:24:40 PM »

Great find indeed MrMidi:aok

USRanger · « **Reply #39 on:** August 18, 2007, 04:12:49 PM »

Midi, I'm getting ready to send you a whole bunch of object & terrain textures. I gotta go thru em & change em all into .jpg format to conserve file size first.

mrmidi · « **Reply #40 on:** August 18, 2007, 04:21:30 PM »

Sounds good US...

Mid

mrmidi · « **Reply #41 on:** August 23, 2007, 06:52:08 PM »

I've added another terrain texture to the textures, section of the site.
A grassy rock.

Mid

Denholm · « **Reply #42 on:** August 24, 2007, 08:58:29 AM »

Might use it for this in the near future: