ACARA 7 : QGIS (Part 1)

Learn how to use QGIS for environmental mapping, including georeferencing, digitizing layers, and applying symbology.

Key Takeaways

QGIS allows detailed geospatial data processing including georeferencing and digitizing.
Proper layer creation and attribute management are essential for accurate mapping.
Symbology and labeling improve map readability and presentation.
Importing external styles and data enhances the visual quality of maps.
Clipping and indexing contour lines help in precise topographic representation.

What the video covers

Introduction to QGIS setup for environmental information system practicum.
Preparation of materials including city maps, RBI symbols, and boundary data.
Creating a new QGIS project and importing raster maps for georeferencing.
Digitizing administrative boundaries, roads, rivers, and points with shapefile layers.
Editing and correcting digitized features using vertex and split tools.
Applying symbology and categorized styling for roads, rivers, and points.
Importing RBI symbol styles and customizing map features.
Adding contour lines from AutoCAD shapefiles and indexing contour attributes.
Clipping contours to administrative boundaries and customizing contour display.
Labeling map features with rule-based labeling and preparing for layout.

Chapters

How do I georeference a map in QGIS?

You add the raster map to the georeferencer, input control points with coordinates, set the correct UTM zone, and start georeferencing. Save the output as a TIF and load it into the project.

What geometry types are used for different map features?

Administrative boundaries use polygon geometry, roads use line string geometry, and points use point geometry when creating shapefile layers.

How can I apply custom symbology to roads in QGIS?

Use the properties menu to access symbology, select categorized style, classify by description, and import RBI symbol styles if needed to customize road appearances.

Full Transcript — Download SRT & Markdown

Speaker A

Welcome to the Environmental Information System practicum event 7, QGIS. First, prepare your materials, such as the UPN logo and your respective city maps. Next, there are RBI symbols, followed by contours. And finally, the December 2019 provincial boundary data from Dukcapil. Okay, next

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we open the QGIS that has been installed. Now, first we go to the project section, then to properties. We will use UTM zone 49S. If you have trouble finding it here, you can type WGS84. Next, you can search for the

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zone number here. Since mine is already showing, we can directly click apply. Okay. Now, next we go to plugins. In this section, click manage. Next, install according to the ones already checked in this section. Like that. You can just stop. Then close it. For the

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first step, let's go to a new empty project. Now, we will first input the map, the Solo one, into the georeferencer layer. We add the raster from the open raster section. Next, we add the Solo city map and open it. Next

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, we will add points to georeference or match it with what is here. Fill them in according to the coordinates. Don't forget to adjust the zone, as I am using zone 49S. Adjust it, then click okay. Do the same for the bottom right

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section. Then click okay. Once done, go to start georeferencing. Choose the setup first. Name it Solo map, keep the save as type as TIF, and ignore the rest. Then the most important part at the bottom is to check load in project

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when done, then click okay. Next, we go to start georeferencing. Once finished, we can close this. Just discard this.

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Next, we will create layers for the research area or administrative boundaries. Next are roads, rivers, and also points. Here in the layer section, click create layer. Then new shapefile layer. For the name, let's start with admin boundary first. For the geometry

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type, choose polygon. Change the coordinate system to 49S. Oh, we will add a table or new field, specifically information like this. Then add to field list. The type remains text. So just add to field list. Okay. Yes. Do

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the same for the roads, rivers, and points. For roads, the only difference is the geometry type, which is line string. Other than that, it is the same. For the points section, use point geometry. Now, once everything is added

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, we will digitize each of the shapefiles here by right-clicking and selecting toggle editing, or using the icon at the top. Next, in this section, there is an add polygon feature, which means we will add and manually digitize

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from this map. Once finished, just right-click. Next, for the input, just click OK for now. Now, to divide this, right-click and go to properties. We will make the gray area disappear first. For the fill style, set it to no

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brush. Now, for the stroke color, make it red. I am using this one here. Then just click OK. Then for the stroke width, we will use two. Like this. Then just click apply. Okay. Now, if there are still mistakes like this, they can

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be corrected using this. In this section, there is a vertex tool. Now, this can be shifted around like this.

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Once done, we can cut this according to the district using the split feature here, or if it is not there, go to edit and then edit geometries. Next, down here is the split feature; click it and follow the boundaries. Now, if it is

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already divided into three like this, we can turn off toggle editing to save it. Next, we move to the road section.

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We will also toggle editing to digitize the road area using this, this add line feature, we just click OK. Next, we will create the other road. Next, we will create the river section. We save first, turn off the river part, turn it

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back on, and then we will create this. Just click OK. Next, the last one is the point. Next, lastly, we will open the table for each of these SHP admin boundaries by going to open attribute table. And since we cannot change this,

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we must toggle editing first to modify it. For example, we will use land use boundaries. Now, once done, just save it. We turn off toggle editing. We save, we close. Next, do the same for the roads, rivers, and also points. Once

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everything is done, we will perform symbology for each of these. First, for the road, right-click and select properties. Now, this is to go directly to symbology. Now, the one used here is categorized. Then for the value, we enter the description. Now, we classify

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this. Then uncheck the one at the very bottom. Here we have an arterial road.

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So we adjust it to the arterial road. Now, here there will be an arterial road. Now, if you are not at this part yet, you can add it on the right side here in the style manager. Then import

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export. So, import items. Now, this is to import from a file. You will select the file from the RBI symbols you have downloaded. Then, if you have clicked open. Next is to select all and import it. Now, once done, just close it. Here

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we will search for the arterial roads. Like this. Okay. Okay. The same applies to collector roads. Now, once that's done, we move on to the river section.

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Because there is only one in the line section, we will put the river directly here. Next, for the points, right-click and go to properties for... Because these are different for each, in the categorized value section, use the classification description. Now, this

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can be adjusted for the village office, district office, and fire station. Once done, just click apply and then click OK. Now, if it's finished, it will appear like this. We can just uncheck the points section. It will appear like

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this according to what we created. Next, finally, we will add a layer, add vector layer, and add contours here by going to vector and clicking the three dots to browse. We will add the contours. I will add the 25K contours

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from the RBI data. The one to be inserted is the AutoCAD compiled shapefile like this. Then open it and just click add. Then it will appear like this. Once it appears, we will first open the attribute table for that

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layer. Next, we will add an index to each of these by turning on the toggle editing first. Next, in this section, open the new field. The name will be index. And the type is integer. Okay, then just click OK. Then we will select

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the one on the far right. After adding the index, we will change this to index. Next, in the expression section, we will fill it using fields and values, specifically the KNT field. Using the percent operator here. Because we are

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using a 12.5 index or contour interval, our contour index is 50. Then next is equals to. 0. Then we click OK. The code will be filled with 0s and 1s like this. The ones here mean they are multiples of 50. Next, we save and then

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close. We will clip the contours using the vector menu. Here are the geoprocessing tools. Clip. This uses the contour line. And for this, the administrative boundary. Then next, for the output location, we use save to file. After this, we can run it. Now,

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it is complete, so click close. We can turn off the contour section now. In the contour line properties. Then for the single symbol, we set it to categorized. We set the value field to IK. Then we classify, there are two, 0

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and 1. Now, for the one here, the color can be changed and the width set to two. Okay. Then for the others, the color is the same but the thickness is one.

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Then we can apply it like this. Then okay. Next, we will do the labeling first in the labels section. Then for rule-based labeling we add the description for IK. For the filter, use field and value equal to 1. Okay, the

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label uses the KNT field. Then for the text font, use Times New Roman. The style and size, maybe size 8 is enough.

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Enable buffer with a size of one. Next, lastly, there is placement the mode set to on line, turn off above line, click okay, apply, then apply and click okay.

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Now, once done, we will also label the admin boundary properties. Symbology simple fill. Oh, this is for categorized and the value is description. Classify. Now, we will create this. Once done, select the label section.

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labels. Next, we will use the value, which is description. Then for the text , use Times New Roman. Then check the buffer and set the size to two. We click apply. Okay. Now, like this.

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Finally, the last part is done, next we will move on to the layouting part.

Topics:QGISGeoreferencingDigitizingEnvironmental mappingShapefileSymbologyContour linesGIS tutorialRBI symbolsSpatial data

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