Praktikum SIG Kehutanan (Geoprocessing Tools) Menggunakan Software QGIS

Summary

This tutorial guides users through key GIS geoprocessing tools, focusing on practical tasks like clipping, dissolving, intersecting, and merging geographic data layers. The session covers steps for downloading, editing, and processing shapefiles, as well as using tools to manipulate spatial data effectively. By the end of the tutorial, users will have the knowledge to manage and refine geographic datasets, including creating new features and exporting selected data, with a focus on the administrative boundaries of Kota Malang, Indonesia. The video encourages hands-on practice with these techniques.

Takeaways

• 😀 Download the Malang City shapefile from the Indonesia Geospatial website and extract it to a folder.
• 😀 Use the GIS software to start a new project and load the shapefile data for further editing.
• 😀 Open the attribute table and sort or remove any incorrect data in the shapefile using editing tools.
• 😀 The Clip tool is used to cut data based on specific boundaries, like roads within administrative areas.
• 😀 The Dissolve tool merges data that shares common attributes (e.g., Kecamatan) to simplify the dataset.
• 😀 The Intersection tool combines two datasets (e.g., roads and administrative boundaries) based on overlapping areas.
• 😀 Digitizing tools allow you to create polygons (e.g., square shapes) to cut specific areas from the dataset.
• 😀 The Union tool merges two datasets into one, maintaining both datasets' attributes.
• 😀 The Difference tool subtracts one dataset from another, allowing you to visualize remaining data after the operation.
• 😀 Data can be saved and exported by selecting specific features, such as particular districts or villages, for further analysis.
• 😀 It is essential to save your work properly and ensure that all files are saved in the correct location to avoid data loss.

Q & A

What is the focus of the practicum in the script?

The practicum focuses on teaching geoprocessing tools in Geographic Information Systems (GIS), specifically using vector data processing techniques.

How can participants download the necessary data for this practicum?

Participants can download the required data by visiting the Indonesia Geospatial website, selecting the SHP format, and downloading the 'Rupa Bumi' data for the Malang City area.

What should participants do after downloading the SHP file?

After downloading the SHP file, participants should cut the file, create a new folder, and paste it into that folder for easy access.

What is the purpose of extracting the downloaded SHP file?

Extracting the downloaded SHP file will make the data accessible for use in GIS applications, allowing participants to manipulate and analyze the spatial data.

What steps are involved in editing data in the attribute table?

Participants should open the attribute table, identify and select incorrect data, and delete it using the 'Toggle Editing' tool to clean up the dataset.

What does the 'Clip' geoprocessing tool do?

The 'Clip' tool is used to cut a vector layer by the boundary of another layer, effectively trimming the data to fit within the selected area.

What is the purpose of the 'Dissolve' tool in GIS?

The 'Dissolve' tool merges features with the same attribute value, making it useful for simplifying datasets by combining data based on shared characteristics, such as merging all data of a specific district or village.

How does the 'Intersection' tool differ from the 'Clip' tool?

The 'Intersection' tool not only clips the data but also combines two datasets, creating new features from the overlapping areas, while the 'Clip' tool only cuts the features based on the boundary of another layer.

What is the role of the 'Union' tool in GIS?

The 'Union' tool combines two layers, including their attributes, to form a new layer containing the spatial features and data of both original layers.

What is the function of the 'Difference' tool in geoprocessing?

The 'Difference' tool subtracts one layer from another, removing areas from the first layer that intersect with the second, allowing for the isolation of features not present in the second layer.

How can participants save their work after completing the geoprocessing steps?

Participants should save their processed layers by choosing 'Save As' to create new files, ensuring the geospatial data is preserved for future use. It's important to ensure that files are saved in the correct directory to avoid data loss.

What should participants do if they encounter the 'Temporary Scratch Layer' message?

Participants should save the temporary scratch layer by naming it appropriately and ensuring it is saved in the correct directory to prevent it from being lost after the session ends.