Frequently Asked Questions
The geoJson Mapper/Viewer app provides navigation for users of all skill levels. Its interface and organization make tasks easy to complete. Major actions are started form the top menu bar.
How do I load a file?
You can load saved or or downloaded files from the Files "📁" Icon .
How do I load a URL?
You can load a saved or new URL from the More "⋮" Icon.
What is a geoJson feature?
There a 3 primary map features (Point, Polygon, and LineString) and 4 collection features (MultiPoint, MultiPolygon, MultiLineString, and GeometryCollection). For more information see https://geojson.org/
How do I see the geoJson features?
Use the Feature Collection Icon to display feature collection in side panel.
How do I see the feature property detail?
You can load a saved or new URL from the More "⋮" Icon.
What does a feature with a "📄" attached to it mean?
The notes icon "📄" Icon is identifies map features that have a note or tag attached to it.
How do I set a feature label?
Normally a feature has a field called name. The value of the name field is the default feature label. This can be reset by holding the the field panel in the feature property. The app will ask you if you want to reset the label property for this collection.
Can I search on a feature label?
Yes, Simply hit the magnifying glass icon, and a search box will come up. The searches the labels for any text you enter, even if its in the middle of the label.
Can I add a note to a feature?
Yes, You an add a note to a feature if the feature has an id field. Notes are maintained across versions of the geoJson file. As long as the geoJson file name is maintained, the feature is also maintained.
Can I email notes?
Yes, There is an icon in the notes list to save all notes from visible collections. Notes are attached as .CSV files.
What is in the Note Pivot screen?
The Pivot screen displays notes grouped by the note property rather than the Feature name. Notes are normally organized and grouped using the feature name. For example, in the demo, the feature 'Seattle' has a note attached to add a note property of 'County' with the value of 'King County'.
In the Notes view, all of the 'Seattle' note properties would be grouped together under 'Seattle'. In the Pivot, the app would show 'County' as the group and include any other feature that had the same note property.
The purpose is to help visualize map features to compare a common note property or tag.
Can I put similar geoJson files in a folder?
Yes, From the files "📁" list, there is an icon to create a folder. Long click the file you want to move then select folder to copy file to. Folders are only one deep. A folder cannot create a deeper folder.
Can I show more than 1 file?
Yes, There is option to visualize all files in a folder. There is a limit of 10 files.
Is there a Web version?
There are excellent 3rd party websites for geoJson. For example, see https://geojson.io/#map=2/0/20
Menu Bar
You control the App using the 4 menu icons at the top of the App.
☰ Open Side Panel
The open side panel icon " ☰ " requests the App to show the latest information requested. many of the items in the More icon open this panel so show information. The android version has this function available from the More icon. In android, you can also slide your finger from the left side to bring in the side panel. The IOS version has its own icon to perform the same function.
📁 Open Files
Open Files icon "📁" instructs the App to show the current list of geoJson files viewed by the user in the side panel. It also allows the user to add show geoJson files on the device by using the plus (+) icon of the right side of the panel.
📍Feature Collection
Feature Collection icon "📍" loads the current list of features. The order of the features is directly from the loaded file or URL.⋮ More Options
More icon " ⋮ " provides the users with additional options, such as summary and demo files.The more options icon provides access to the about, reference, collection summary, feature geometry, examples, notes, and map backgrounds.
References and Data
geoJson Specification
geojson.io
The following URL allows users to view and edit geoJson files. See https://geojson.io/#map=2/0/20
Sample Data
USGS https://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.phpUS Gov https://data.gov/
Canada https://open.canada.ca/data/en/dataset/85efc01b-163f-ebba-2378-c43eadfb3b3f/resource/4137a99d-f5dd-4e69-9e13-a587ff6eaa55
Versions
Version 1.1
Initial tested release of application
Version 1.2 (Released 7June2026)
The following enhancements are added:
Collection and Feature notes (add comment or emoji to feature or collection)
Feature grouping by collection (for example, use road property to group addresses)
Group sequencing by collection (for example, order addresses using house number)
Feature tagging (add text or emoji tag from collection tags). Add fixed tags to collection that can be selected for any feature.
Ability to Pivot Notes and Tags. Normally, notes and tags are organized as "name" "property" "value". A pivot allows you to display data as "property" "name" "value". The benefit of a pivot is to group all notes and tags with a common property together. Notes organizes the information according to the feature "name". Pivot organizes the information using the "property".