madmat

Holger, Thanks for clearing that up, I misunderstood and thought that SRTMFill provided a good alternative. I can see in your example the odd clipping and see that for such it would not be very good. I did use it on Manitoba and Saskatchewan and as you say, flat land is not a problem :)I'll read up more on Blackart and see how I can use it for higher areas.Dwayne

hello Lars,http://www.3dnature.com/ is the address of a website that has the SRTMFill program that Holger found and recommended in another thread. This works very well to fill voids in the hgt files. You could also use Blackart which can do a fill or merge other data to help fill the voids too.I used the same SRTM data that Holger pointed you to. I also read your step by step process that you are going to use and commented a little there. I have not really dived into changing coastlines and landclasses yet, I am just happy to get a good mesh base to start with :)Dwayne

Hello Lars,Nice idea to put it step by step. I am sure that some folks here who have done this for a while will have great advice, but let me offer mine too, as I learned most of it here anyway.You should check each .hgt file for holes in the data and try and patch them. I was using 3dem to patch the holes, but Holger recommended a great filler called SRTMFill. I run it on each .hgt file before I do anything else to it. You could also use Blackart to fill the holes or even merge other GIS data to help fill the holes, but the SRTMFill seems to do an good job for me.For areas around the sea I used the Blackart program to lower the sea state. You can put in your own height data, I just used the default. It helps to flatten the ocean, although anything higher then the default shows as a small bump on the TMFViewer (I use the LWMViewer now though).Lastly, don't try to force your data into higher LOD. I tried it to see what happens, and for me it seemed to be less sharp. Keep to the recommended LODs for your data. The 3 arc second makes very nice LOD9 mesh, you can make LOD10 mesh with it, but why? :)When you are done making your mesh, let us know! I am always looking for nice freeware mesh to enhance the world.Dwayne

Hello Dick, Thanks for the ideas, perhaps the mesh clinging water will work, and be a little easier than the "hunt through the exported data" method :) I like the mesh I made, I think it looks pretty good, but I dislike craters filled with water and lake plateaus, and so a way to fix them would be nice. I'll watch for the library to come back online and then search for the LWM converter and have a hack at that.ThanksDwayne

Wow, nice answer! I'll get the LWMViewer and have a look through some of the documents I can find to see if I can do this. Sounds daunting, but may be easier than I think... and then again, maybe not! I have noticed that many lakes are not at the elevation that the Natural Resources says they are.Thanks for the answer, I'll give it a try.Dwayne

Hi Lars,I did a little mesh around your area, I tried to use Blackart to flatten the sea, and it worked fairly well I think. I used the SRTM fill program before I moved it all into srtm2bgl and the mesh looks better than the default. The area is N33 E 22 up to N40 E25, is about 9 Meg and I'll upload it to Avsim when they get up and running again, if you like.Dwayne

>For Canada, there's Gilles Gauthier's excellent mesh series of the Maritimes, Quebec, and Nunavut. He's done a ton of work to make the lake >levels and default coastline match with the LOD9 add-on mesh >and, in fact, pioneered a method for lake elevation patches that I then used for my B.C. and Alberta mesh files. Hi Holger,What was the method used to do the elevation patches? I have tried TMFFlatten but it is a bit tedious. It does work though. I have a decent Mesh of Manitoba now, and I redid my Saskatchewan using the SRTM Fill program and I am fairly pleased with the final output except the lakes.Any help would be niceDwayne

Hi all,I have had a bit of success creating some LOD8 and 9 meshes for western Canada but I am having a bear of a time with the Manitoba data. Every time I try to create anything, either using srtm to bgl or even by hand, I wind up with very odd results.For example, I have the CDED 1:250,000 data and I mergerd 6 dems using Microdem latest build. I then converted this to a bsq and created an ini for resample. So far, so good. I notice Microdem said it was decim data so I set the scaleinmeters=.1 and I created a bgl that looks fairly representative of the data I fed it.I then tried the next 6 dems and this is where it got wierd. Same data source, programs and ini but a blank bgl, nothing to see in bglviewer. I tried using SRTM 3 arc second data from the USGS server but wind up with a totally flat landscape and wierdness. Just with the Manitoba data it seems.I am open to any sugestions or help. I even deleted the data and redownloaded it just to see what would happen, no luck.Thanks,Dwayne

Hello All,I am new to making meshes and I have uploaded a few of Alberta to the ACOF Scenery area. I received an email about a large trench across the whole province basically and wonder what I did to create it.The mesh was created using SRTM data at 3 arc seconds and I used the wonderful srtm2bgl program to assemble the bgl file. Perhaps I should have overlapped the mesh areas so I would not have a possible seam in the mesh?If I could, I would ask the File Library folks to pull the NW Alberta mesh so I could try and find the problem and not have people waste d/l time on a goof on my part!Thanks in advance, and I have enjoyed lurking here so much I thought that I would try my hand at this, it is kinda fun!Dwayne MathesonWinnipeg, MB