Poppleton Maps of Baltimore, 1822 & 1852

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When Anthony Freeman worked for me at the Baltimore City Archives, I assigned him the task of placing the 1822 and 1852 Thomas Poppleton maps of Baltimore on Google Earth as a research resource for anyone interested in the history of Baltimore City. My essay on the creation of the Poppleton map is to be found on my blog and published in the The Portolan, the Journal of the Washington Map Society, issue 99, Fall 2017. The images of the two maps were taken from a scan of the 1852 Poppleton which I purchased and gave to the Maryland State Archives, and from a jpg of the copyright office copy of the 1822 Poppleton that I downloaded from the Library of Congress web site.

Anthony's placement of the two maps on Google Earth is to be found and downloaded here as a kmz file. A kmz file is a zipped file of everything including images and urls that Google Earth needs to map and illustrate the contents of the kmz file. Download the file to your local drive and access it by clicking on it.

In order to access the kmz file, Google Earth or Google Earth Pro (both free) must be installed on your computer. Once the kmz files is loaded as a temporary file into your Google Earth, you can move it to your permanent Google Earth files and save it to your computer where you can work with it whether or not you are connected to the internet.

Google Earth can be downloaded here

When you have loaded the kmz file into Google Earth, you can search for current addresses in the upper left box, or when you have highlighted my places, you can press control-F to search through the placemarks. This search does not go beyond the titles of the place marks. Any text associated with the placemark is not searched.

Once you have loaded the KMZ into Google Earth and saved it to my places, you can view the contents of the kmz off-line (meaning when you are not connected to the internet) but do not make any changes or additions until you are back on line.

There are some quirks with regard to how Google Earth works (nothing is truly free in this world). Most importantly the loading of a new kmz file needs to be clean and not encumbered by data already in the cache of your computer. In loading a new KMZ file and periodically working with a KMZ file that you have been using, you should clean out the system and reload your file. What that means is that you should keep a clean backup copy of what you are working on in storage on a regular basis (at least once a week or whenever you make major additions and alterations. You should do so to a backup usb drive or your cloud service (Google Drive is probably the best and safest place as long as it is linked to a local backup of what you have on Google Drive. I maintain backups of my working KMZ files on my Google Drive as well as this one for your use that is on my personal server.

Before you load a new kmz file (or after you have backed up your working kmz file), you should clear out your cache so that your current copy of Google Earth contains no personal kmz files. Once you have saved any working files, delete them on Google Earth by placing your cursor on "My Places", right click, and delete contents Then sign out from the Google Earth Server. You do this by going to the drop down menu under file in the upper left corner of Google Earth and click on "Server Sign Out." Then go back to the drop down menus at the top of the Google Earth screen and click on "tools", then click on "options" on the drop down list. Go to the "Cache" tab, click on it, and then click on the "delete cache" button. Close the screen and return to the file drop down in the upper left corner of Google Earth and turn the server back on by clicking on "server sign in". Once you have done that, load the KMZ file from here, or your storage location, and all should work smoothly.

For those of you who already have installed Google Earth or Google Earth Pro, the Poppleton kmz file should load into your temporary folder. If you wish to save the Poppleton files, you can save them to "my places" and work with them there.

Note also that the Google Earth does have a modest search capability for folder titles only. Place your cursor on the highest level of the KMZ folder listing and activate by using "Control F". A search box will appear in the left column. This search does NOT including annotations within a folder at the present time (2017/11/03).

Ed Papenfuse edpapenfuse@gmail.com 2017/11/03