> For the complete documentation index, see [llms.txt](https://docs.geopard.tech/geopard-tutorials/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.geopard.tech/geopard-tutorials/ar/twthyq-api/nzrh-aamh-ala-tlbat-geopard-api/48.-alastalam-jlb-albyanat-alshbkyh-mn-topographymap.md).

# 48. الاستعلام: جلب البيانات الشبكية من "TopographyMap"

استعلام للحصول على بيانات المصدر من مجموعة البيانات النقطية المتعلقة بـ "خريطة التضاريس" كـ `GEOJSON`  بنقاط أو `GEOTIFF`السمة properties تحتوي على جميع المشتقات الطبوغرافية (مثل نموذج الارتفاع الرقمي، الانحدار، جزء الإغاثة، الخشونة، التعرض، تظليل التلال، إلخ) لكل نقطة. 

#### 1. اطلب ملفًا للتصدير

{% hint style="danger" %}
يوصى باسترداد مجموعة بيانات واحدة فقط باستخدام `sourceDataUrl` لكل طلب. 
{% endhint %}

`NoBuffer`, `PlusOnePixel`, `PlusTwoPixels`, `MinusOnePixel`، و `MinusTwoPixels` متاحة كـ `عازل`.

`GEOJSON` و `GEOTIFF` متاحة كصيغة. 

{% code overflow="wrap" lineNumbers="true" %}

```graphql
query GetGriddedDataFromTopographyMap {
  getFarms (farmUuids: ["<placeholder_of_farm_uuid>"]){
    uuid
    fields (fieldUuids: ["<placeholder_of_field_uuid>"]) {
      uuid
      topographyMaps(topographyMapUuids: ["<placeholder_of_topography_uuid>"]) {
        uuid
        sourceDataUrl(format: GEOJSON buffer: PlusTwoPixels)
      }
    }
  }
}
```

{% endcode %}

#### 2. قم بتنزيل الملف المُولَّد

بعد التحضير الناجح للملف، من الممكن تنزيله باستخدام `curl` أو نهج مشابه.

{% hint style="danger" %}
`sourceDataUrl` الرابط متاح فقط لمدة **60 ثانية.**
{% endhint %}

{% code overflow="wrap" lineNumbers="true" %}

```bash
curl '<sourceDataUrl>' --compressed >> '<local_filepath>'
```

{% endcode %}


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