Geo Data Wizard
After reading this page:
- you've learned what the Geo Data Wizard is.
- you've learned how the Geo Data Wizard relates to the Tygron Platform.
- you've learned how to use the Geo Data Wizard.
The Geo Data Wizard
The Geo Data Wizard or in short Data Wizard is a series of steps to guide you through the process of importing Geo data in the Tygron Platform. It is designed to minimalise the use of a GIS for preparing the data.
There are several different Data Wizards which each guide you through different processes for importing Geo data in the Tygron Platform.
The different wizards are for importing data as:
- Buildings - Importing Constructions (3D-objects) into the model and for updating attributes of Constructions based on the attributes in the data
- Terrain - Importing shapes to define the terrain
- Neighborhoods - Importing shapes to define the neighborhoods
- Zoning - Importing Zones in the Zoning plan (Bestemmingsplan)
- Areas - Importing areas to create a 2D Overlay
- Measures - Importing a group of 3D-objects as a measure to perform as an action
Each of these wizards contain comparable steps which are described below.
The wizard can be found by following these steps:
Steps in the Geo Data Wizard
In the data wizards there are several steps to guide you in transforming your dataset in order to only import the relevant features in the data into the Tygron Platform.
There are three methods for importing Geo Data in the data wizard. These methods can be divided into two: uploading data from a file to the Tygron Platform and the other is downloading data through an URL to the Tygron Platform.
- Through a GeoJSON file
- Through a Web Feature Service (WFS)
- Through a Catalogue Service for the Web (CSW)
The method to choose is based on how you have your data available. If you have a file with data, choose the first option. Make sure you create the GeoJSON file first, if your data is in another format. If you have an URL on where dats is published according to the WFS standard, choose the second option: WFS. If you do not have data available but want to browse through an online catalogue in search for datasets or you have a Catalogue service URL, choose the third option: CSW.
In step 2, the data that is currently in your project in the Tygron Platform is visible. The amount of points, lines or polygons in the dataset are visible. Since only polygons are allowed in the Tygron Platform, the points and lines need to be buffered. By buffering these features, the points and lines become polygons. The buffer size is adjustable. Based on the data, choose a realistic buffer size. If your dataset contains of lines which represent roads, choose a buffer size that is realistic for the width of these roads. if your dataset consists of only polygons, the buffer size is not used.
In the next step you can filter the features. For example, if you have a dataset containing all sorts of roads, you can filter only the highways in this dataset. The filtering is based on Attribute name ( attribute textual value) or on Attribute value(a numerical condition). For example, if the roads have an attribute max. speed in km/h. You can filter the roads that have a max. speed of 80 or more km/h to get only the highways.
Add or update
In this step you are asked whether you want to add new data or update the data already present in your project. This is based on the type of data and how you are adding the data, as either constructions or areas. If you want to import the roads dataset as functions while there are already roads present in the project, updating would be the way to go.
As mentioned in the requirements for importing geo data in the Tygron Platform, only numerical attributes can be imported. In this screen all the attributes in the dataset are listed. The attributes that are numerical, are already checked. In the TQL Name column, you are given the option to rename your attribute.
Name the features
If you choose to add new features, the Naming step will be visible. This step is necessary to keep track of the data you imported in the Tygron Platform. With a clever chosen name, it is easy to distinguish features from each other. There are three options for naming your features:
- By their file name
- Based on an attribute
- A word with a number
If you choose the Geo Data wizard for:
you will be asked to choose a function for the features in your dataset. You can choose one function or choose multiple, based on an attribute name or an attribute value. The latter option is necessary when you have multiple different functions in your file, such as trees and roads.
Choose the owner of the features you want to import. Also, multiple owners can be chosen, based on a mapping of attribute names or attribute values.
Error messages in the Geo Data Wizard
Errors when importing data most of the time have to do with no CRS (Coordinate Reference System) or the wrong CRS definition.
- No CRS defined
"Invalid detected CRS name: null"
Error: This error message means that the dataset you are trying to import does not have a CRS (Coordinate Reference System) and therefore the Tygron Platform can't place the data on the right location. This error mostly occurs when having a GeoJSON file without a CRS property defined.
Solution: Open the GeoJSON file in a GIS and save it with the correct CRS, so the property is added to the GeoJSON file. See below for the steps in QGIS.
- The imported data does not have a location anywhere in your project
"Detected CRS: urn:ogc:def:crs:EPSG:3857 Numer of Features in this project map: 0" (or something similar)
Error: Geo data always has a location in the real world. This error message means that the dataset you are trying to import does not have a location in your project. For example if you have a project of an area in Amsterdam and you are trying to import data of neighborhoods in the Hague, you will get this error message. If you are sure that the data you are trying to import is in the same location (for example data of neighborhoods in Amsterdam into a Tygron Platform project in one of these neighborhoods in Amsterdam), the error message could also mean that the defined CRS is not correct for the data.
Solution: Import data that has a location in your project or if you are sure that the data you are trying to import is in the same location, open the GeoJSON file in a GIS and save it with the correct CRS. See below for the steps in QGIS.
- Longitude and Latitude error
"Invalid:um:ogc:def:crs:OGC:1.3:CRS84 Coordinates: Latitude 393 44.4'N is too close to a pole" (or something similar)
Error: This can happen when importing a dataset in the WGS84 Coordinate Reference System (EPSG:4326) and means that the data can not be correctly imported by the Tygron Platform.
Solution: Open the GeoJSON file in a GIS and transform the data to a different CRS. See below for the steps in QGIS.