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# OpenTopography DEM 下载使用示例
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## 快速开始
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### 1. 获取免费API Key
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访问: https://opentopography.org/myOpenTopo
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- 注册账户 (免费)
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- 在 'My Account' 页面请求 API key
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- API key 立即可用
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### 2. 下载不同分辨率的 DEM
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#### SRTM 30m (推荐)
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```bash
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python makedem.py -r 116/117/39/40 --dem-source srtm \
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--opentopo-api-key YOUR_KEY \
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--opentopo-dem-type SRTMGL1
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```
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#### SRTM 90m
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```bash
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python makedem.py -r 116/117/39/40 --dem-source srtm \
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--opentopo-api-key YOUR_KEY \
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--opentopo-dem-type SRTMGL3
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```
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#### NASADEM 30m
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```bash
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python makedem.py -r 116/117/39/40 --dem-source srtm \
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--opentopo-api-key YOUR_KEY \
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--opentopo-dem-type NASADEM
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```
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#### Copernicus 30m
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```bash
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python makedem.py -r 116/117/39/40 --dem-source srtm \
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--opentopo-api-key YOUR_KEY \
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--opentopo-dem-type COP30
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```
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#### Copernicus 90m
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```bash
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python makedem.py -r 116/117/39/40 --dem-source srtm \
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--opentopo-api-key YOUR_KEY \
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--opentopo-dem-type COP90
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```
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## 数据对比
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| DEM类型 | 分辨率 | 覆盖范围 | 推荐用途 |
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|---------|--------|----------|----------|
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| **SRTMGL1** | **30m** | 60°S-60°N | **SRTM研究首选** |
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| SRTMGL3 | 90m | 60°S-60°N | 快速预览 |
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| **NASADEM** | **30m** | 60°S-60°N | **高精度研究** |
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| **COP30** | **30m** | 全球 | **全球覆盖首选** |
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| COP90 | 90m | 全球 | 快速预览 |
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## 推荐选择
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1. **SRTM研究**: SRTMGL1 (30m)
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2. **高精度需求**: NASADEM 或 COP30 (30m)
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3. **全球覆盖**: COP30 (30m)
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4. **快速预览**: SRTMGL3 或 COP90 (90m)
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## 注意事项
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- **SRTMGL1/COP30/NASADEM** (30m): 最大支持 450,000 km²
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- **SRTMGL3/COP90** (90m): 最大支持 4,050,000 km²
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- 所有数据集需要 OpenTopography API key
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- 免费配额足够大部分科研用途
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## 输出文件命名
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- SRTMGL1_116_117_39_40.tif
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- NASADEM_116_117_39_40.tif
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- COP30_116_117_39_40.tif
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文件名格式: `{DEM类型}_{西经}_{东经}_{南纬}_{北纬}.tif`
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---
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**更新日期**: 2026-03-13
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