Formerly called Geospatial Images, map sheets are any image that can be referenced to a place on the surface of the earth.
Supported file types include JPG, TIFF, or PDF files.
Map sheets can be viewed and stacked just like base layers in the map viewer, although they are more limited in geographical scope. This is a great solution for displaying local data, such as a map of campsite and boat launches or state park trail systems, in CalTopo.
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There are two pathways for adding a map sheet to your map: use a publicly available shared map sheet or, if you have a pro, desktop or team account, upload your own for personal use.
First let’s look at how to add and use shared map sheets.
Shared map sheets are available to all users.
You can add a shared map sheet to your map using either the Map Sheets menu or the Shared Map Sheets overlay.
For either method, first navigate the map to view the area you are interested in.
To access shared map sheets using the Map Sheets menu, click + Stack Map Sheet under Map Sheets in the Map Layers menu.
A blank dropdown menu will appear first. Click that dropdown menu and any shared map sheets in the map viewer area will be listed.
If you are zoomed out too far, you will get the following message: Zoom In To See Shared Map Sheets. Zoom in more and try again.
Select the map sheet you wish to view from the list and it will be added to your map at 100% opacity by default.
To access shared map sheets using the Shared Map Sheets overlay, turn on the overlay in the Map Overlays menu. Each available map sheet will appear as a transparent white rectangle. You can filter the type of map sheets displayed using the dropdown menu to the right of the overlay.
Click on a rectangle in the map viewer and a dialog box appears with the name of the map sheet and links for additional actions.
Clicking More Info will expand the dialog to display basic background information about the map sheet. If you are logged in, clicking Add to Account will save the map sheet to your account under the Map Sheets tab. Clicking Add to Map will add the map sheet to the map at 100% opacity by default. The map will also appear in a Map Sheets folder in the left side bar and under Map Sheets near the top of the Map Layers menu on the right hand side.
Once you’ve added a shared map sheet to your map, you can further adjust how it's displayed using the options next to and directly below the name of the map sheet in the Map Sheets dropdown menu.
Click the zoom to extent icon directly below the map sheet’s name to zoom the map viewer to fit that particular map sheet. You can click crop to neatline if the border of the map data has extra blank area or text outside of it. Selecting this option will hide anything outside the border of the map data (also known as the “neatline”). You can also adjust the opacity of the map sheet in the same way you do for base layers: either manually enter the desired opacity or move the opacity slider.
You can add as many shared map sheets as you would like using either method. If you wish to remove a map sheet from the map, click the X next to the name of the map sheet in the Map Sheets menu.
Any user can submit a map to be reviewed for inclusion in the overlay at caltopo.com/submitmap. CalTopo will assess all maps for quality as well as copyright issues.
Currently you can only find new shared map sheets or upload personal map sheets on the web. However if you save a map sheet to your account on the web, you can also access and use it on the mobile app. To view map sheets saved to your account on the mobile, click on the 3 bar menu in the upper left hand corner of the map viewer and then select Map Sheets.
A new screen will open with a list of the map sheets saved to your account.
Although syncing with the cloud should occur automatically, you can manually update the map sheet list with the cloud by pressing the sync icon in the upper left hand corner. You can also download or delete map sheet data using the Edit link.
To the left of each map sheet name in the list is an icon that indicates if the map sheet is saved to your device. You must save a map sheet to your device in order to use it without a data connection.
To the right of each map sheet name is an information icon. Clicking that icon will open up a new screen with that map sheet’s details, including its name, size and whether or not it is saved to your device.
If a map sheet is not saved to your device, click the download icon in the upper right hand corner and the map sheet will be saved to your device.
If a map sheet is saved to your device and you want to remove the downloaded data, click the garbage can icon in the upper right hand corner.
A dialog will appear confirming that you want to remove offline data for the geoimage. Press Ok and your map sheet will no longer be saved to your device; however it will still appear in your Map Sheet list.
To view the map sheet in the map viewer, select Show on Map at the bottom of the screen. You will be redirected to the map viewer and your map sheet will be displayed.
The added map sheet will also appear in the Map Sheets dropdown menu on the Map Layers page. Click the layers icon in the upper right hand corner of the map viewer to open the Map Layers page.
Your map sheet will be visible in the Map Sheets dropdown menu.
The map sheet will be displayed at 100% opacity by default and you can adjust the opacity using the dropdown menu. You can also select "crop to neatline" in order to hide excess information or space outside the map data border. To remove the map sheet from the map viewer, click the X to the left of the map sheet name.
You can also add any map sheets you have already viewed in the map viewer from the Map Layers page. Simply click + Stack Map Sheet and then select the map sheet you wish to display from the drop down menu.