The highly compressed FS Global Ultimate “The Americas” terrain files. New mesh terrain. FS2004 mesh scenery product. This new product. Global Terrain Maps: Global Terrain Map – 580 MB GeoTIFF. New Mexico: South. Tags: Blue Marble, Global, NASA, SRTM, Terrain, Terrain Maps, Topographic. Ok, although there’s no screenshot included of FSGlobal Ultimate “The Americas”, this is a Swiss example and Switzerland is not included in the Americas, but my intention is to show you that source material quality (LOD11 versus LOD13 and source 19m versus 5m) is not the only moneymaker for a good product. As you can see, the FS Dreamscapes source material of 5m/LOD 13, should give a better result, however, the FSGlobal source may be of a lower quality, but different techniques are used, which result in a better output. Of course, all in relation to the real Dufourspitze. There’s not even a need to add a FSX default image, since we all want an “as real as it gets” Dufourspitze and for sure Microsoft’s default mesh scenery for Switzerland is far from real. Let’s go for another comparison, the famous Swiss Matterhorn. On the right hand side you’ll see a very nice picture of the real Matterhorn. That’s the developer’s goal. In this case, FS PILOT’S goal is to create as far as possible a real mesh scenery Matterhorn shape. FSGlobal products don’t replace the default FSX ground textures tiles. That said, it could be that the way the Matterhorn looks like, isn’t real, but that “look alike” has nothing to do with the mesh scenery. That this example compares FSGlobal with FS Dreamscapes isn’t really important. It could be, if I wanted, FSX default from Microsoft however, there’s a reason for this. As you can see in this example, the FS Dreamscapes source material is of a better/higher LOD namely 13 instead of 11. But with this example, we hope to show you that not only the source (LOD) material is important. What is probably more important is the processing of this data and thus the final output. Because FSGlobal uses a different processing technique, the output is much more realistic compared to the FS Dreamscapes. That’s the whole idea of this comparison! By the way, when I say “much more realistic”, this is of course in relation to the real Matterhorn picture. What competitors are doing is not important for a PILOT’S. For PILOT’S, it’s important is the output mesh looks as close as possible to the real image. And no, we’re not yet ready with this. The main reason for you to see all these differences is to convince you about FSGlobal impact. We all know that FSGlobal has offered mesh scenery for years and it seems with every new product, the LOD is lifted to a new standard, but at the same time, the processing of the source is modified. Modified means in this case producing an even better output and that means an even more realistic look compared to the real mountain or whatever you’re comparing. Buku usm stis dan pembahasan pdf pdf. By the way, don’t expect a high quality look alike when the scenery is flat. Flat is flat and stays flat! It’s logical, but not always clear to others. Let’s go for some other examples, but this time based on ASTER data sets. For those who aren’t familiar with ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer), it’s an imaging instrument flying on Terra, a satellite launched in December 1999 as part of NASA's Earth Observing System (EOS). ASTER is a cooperative effort between NASA, Japan's Ministry of Economy, Trade and Industry (METI) and Japan's Earth Remote Sensing Data Analysis Center (ERSDAC). ASTER is being used to obtain detailed maps of land surface temperature, reflectance and elevation. ASTER‐Data sets. S chand pdf. Are freely available in GeoTIFF format and they can be converted into BGL files within minutes without special knowledge with the help of files from the FSX‐SDK. Here a sample of an area in the Himalayas, the 8200m high Cho Oyu. At first sight, ASTER seems to be more detailed and to offer more features. But if you compare it to reality (picture on the right hand side, retrieved from DAV Mainz ‐ Cho Oyu Expedition 2010) you will see that FS Global delivers a more smooth (tradeoff to the resolution), but much more “real” terrain (tradeoff to the resolution). ASTER shows features which simply do not exist. It is like Disneyland! Additionally, there are deviations in altitude of several 100m. Again, not only the LOD is the factor that offers you the best mesh scenery, it’s partly a combination of the source material (LOD) and the processing technique used. Finally, the right combination gives the best realistic view although the source material could be of a lower LOD. Let’s show another example from the same mountain, but taken from a different angle. What’s the problem here? ASTER Data sets. Are full of errors. The ASTER makers write in bold letters into their documents “ ASTER GDEM does contain residual anomalies and artifacts that degrade its overall accuracy, represent barriers to effective utilization of the GDEM for certain applications, and give the product a distinctly blemished appearance in certain renditions etc.” Also, while the elevation postings in the ASTER GDEM are at 1 arc second, or approximately 30 m, the detail of topographic expression resolvable in the ASTER GDEM appears to be between 100 m and 120 m. As a general note, because there are known inaccuracies and artifacts in the data set, please use the product with awareness of its limitations. Conclusion: Terrain Scenery based on ASTER data sets. Only makes sense at resolutions of 100m - 120m. It can definitely not be used for higher resolutions. Normally I would say that these examples are enough, but there’s one more example I want to show you. Download age of empires 4 for pc. The following examples or comparisons let you understand that LOD is a nice figure to have, but only a small issue in the final process to a realistic and high representation of the real mountain.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |