从哪里获取地形数据 - 免费和付费？
从哪里可以获得地形数据？您可以免费获得什么分辨率的数据？购买数据能得到什么分辨率的数据？这个数据有多少？我发现此网站有免费的地形数据。分辨率为30m x 30m。这是可以免费找到的最好的吗？
Where can you get terrain data? What resolution data can you get for free? What resolution data can you get when you buy the data? How much is that data? I found this site that has free terrain data. The resolution is 30m x 30m. Is that the best that can be found for free?
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30m 精度数据集来自 NASA 全球数字高程模型于 6 月开源。它是由热成像数据得出的，精度数字比较保守，在实践中很多时候，如果没有太多植被，精度为更好。以下是 ASTER GDEM 为加利福尼亚州死亡谷生成的输出示例：
The 30m-accuracy data set is from the NASA Global Digital Elevation Model which was open sourced in June. It is derived from thermal imaging data and the accuracy figure is conservative, in practice a lot of the time, if there is not too much vegetation, accuracy is better. Here is an example of an output generated by the ASTER GDEM for Death Valley, CA:
加拿大最好的免费地形数据来自 Geobase CDED。高程数据根据国家地形系统 (NTS) 分为图块，类似于 USGS 四边形网格。对于 1:50K 和 1:250k 比例数据，像素尺寸分别为约 15 米和约 90 米。
我镶嵌了 50k CDED 并将其放在网上，该工作的介绍页面是此处
低分辨率（~900m）国家级 获取
名为 Canada3D 的模型可以从 GeoGratis 更全面的加拿大海拔数据列表可以在 http://www.vterrain.org/Locations/ca 找到/
@RED SOFT ADAIR-StefanWoe - 您询问了有关德国的问题，请参阅 http://www. vterrain.org/Locations/de/
The best available free terrain data for Canada is from Geobase CDED. The elevation data is split into tiles based on the National Topographic System (NTS) which is analogous with the USGS quadrangle grids. The pixel dimensions are ~15 and ~90 metres for 1:50K and 1:250k scale data respectively.
I mosaicked the 50k CDED and put it online, intro page for that effort is here
A low resolution (~900m) national model called Canada3D can be nabbed from GeoGratis
A more comprehensive list of Canadian elevation data can be found at http://www.vterrain.org/Locations/ca/
@RED SOFT ADAIR-StefanWoe - you asked about Germany, see http://www.vterrain.org/Locations/de/
来自国家高程数据集。
From the National Elevation Dataset.
另请查看 USGS：http://seamless.usgs.gov/index.php
看起来美国的分辨率为 10m x 10m。
Also look at the USGS: http://seamless.usgs.gov/index.php
It looks like they have 10m x 10m resolution for the US.
我成功地从两个网站检索了数字高程模型 (dem) 数据。
WebGIS拥有免费的30mx30m分辨率数据。
MapMap 拥有 10mx10m 分辨率数据，每个数据四边形 5 美元（约 10 公里 x 10 公里区域） 。最低订购量为 15 美元。因此，如果您想走这条路，您需要购买 3 个四边形的数据。
此网站提供有关 DEM 文件的信息，包括文件格式规范。
应该有一些网站免费提供 10m 分辨率数据（例如这个）但我找不到免费下载的链接。
接下来，我想获取我下载的数据的航空图像。当我弄清楚这一点时，我会发布该信息。
I successfully retrieved digital elevation model (dem) data from two web sites.
WebGIS has free 30mx30m resolution data.
MapMap had 10mx10m resolution data for $5 per data quad (about 10km x 10 km area). The minimum order is $15 though. So, if you want to go this route, you need to purchase 3 quads worth of data.
This web site has information about DEM files including the file format spec.
There are suppose to be web sites that offer the 10m resolution data for free (like this one) but I couldn't find the links to the free downloads.
Next, I want to get aerial imagery for the data I downloaded. When I figure that out, I'll post that information.