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Leander, TX 78641 USA

1. Toledo, Ohio, April 12, 1861. Moved to Cleveland, Ohio, April 25, 1861 thence to Columbus Ohio, May 22, 1861. Left state for West Virginia, May 27, 1861. Moved to Clarksburg, May 29, 1861, and to Phillippi June 2, 1861.

In the 10th Century, the Kingdom of Francia is divide by 3 country: West, Middle and East Francia. But I don’t see it in OHM. Anyone can add it? Country need to add and edit: 1. West Francia 2. Middle Francia 3. East Francia 4. Holy Roman Empire 5. German Reich in 1942 has invaded Netherlands and Belgium

While mapping the British Empire (completed in early 2025) I had mapped almost all of New Spain in the process. So I immediately started mapping the rest of the Spanish Empire in South America and the Pacific.

Then I took a break for awhile and concentrated on roads and railroads in Mexico and Belize. Last week I did some fixes and cleanups on the Spain relation and then tonight I completed the Spanish Empire.

Main chronologies of the Spanish Empire

Spanish Empire
Spain
Viceroyalty of Peru
Viceroyalty of the Indies
Viceroyalty of New Spain
Viceroyalty of the Rio de la Plata
Viceroyalty of New Granada
Captaincy General of Guatemala
Captaincy General of the Philippines
Captaincy General of Cuba
Captaincy General of Chile
Captaincy General of Venezuela
Captaincy General of Santo Domingo
Captaincy General of Puerto Rico
Captaincy General of the Yucatan

Discovered this new mapping site and checking it out. Not very useful YouTube videos out there on just the basic functionality of how to do things. Started off using Google Earth, then switched over the QGIS. Will give this a try and see how it does.

Vector tiles API: https://vtiles.openhistoricalmap.org/

One of the most frequently added data types in OpenHistoricalMap are boundaries. These are often represented as relations and ways, these relations are imported into the PostGIS tiler database. Many of these polygons are quite complex, sometimes covering entire countries or continents and for each relation/way, a polygons are generated.

Examples:

• Around 362 boundary relations represent British Empire on OHM over time.
• Around 1100 boundary relations, represent San José - California on OHM over time.

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Previous Workflow for Vector Tiles

In the previous version, vector tiles were generated directly from raw boundary geometries. This method resulted in slower tile response times and significantly larger tile sizes, particularly when handling complex or high-resolution polygons.

We use PostGIS’s ST_AsMVTGeom function to generate vector tiles. When working with ST_AsMVTGeom and complex, global-scale geometries—especially those with thousands of vertices—the clipping process (cutting to the !BBOX!) can introduce significant computational overhead. This becomes especially problematic at lower zoom levels, where a single geometry may span multiple tiles, triggering expensive intersection and transformation operations.

Over time, many users began noticing that tiles were loading too slowly, particularly in regions with dense boundary data. This performance bottleneck in the boundaries layer also negatively impacted the loading speed of other map layers, resulting in an overall degraded map experience.

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Improving Performance with Complex Boundaries

📎 From: GitHub Issue #800

To address the previous version of the tiler, we conducted a detailed analysis of the boundary data and implemented a merging strategy.

… See full entry

Attempting to collect the most accurate historical maps of Middle Georgia.

I found something interesting while working on mapping historical streets in my hometown of Cincinnati. Take a look at Alexander St on J.H. Colton & Co.’s 1855 map, the oldest map I’m aware of that includes the street:

Here’s how S. Augustus Mitchell depicted Alexander St on his 1860 map:

… See full entry

I have completely mapped the British Empire, here is my journey.

I started mapping on OpenHistoricalMap in 2019 because of things I had to erase on OpenStreetMap that I wanted recorded for histories sake.

In August 2024 I mapped the boundaries of Central America. Then I read on the forum about a project to map the HRE. I thought of helping, but I didn’t really know much about mapping large relations yet, so instead I opted to start mapping the British Empire.

So from September 2024 - February 6 2025 I spent a crazy amount of time researching the boundaries and border changes of the British colonies. I created a spreadsheet to generate the tags for the relations and another formula to generate the chronologies. This made it very easy and efficient to map the Empire.

In the process of mapping the British Empire I’ve almost completely mapped the other European empires, the Spanish, Dutch and French empires. I might try to complete some of these empires in the near future.

Stats

The chronology has 323 members.

The largest relation has 1817 members.

Examples

Largest extent in 1920

Before American Revolution in 1776

Last relation in 1997

Relation with most pieces (1817) in 1900

British Empire Chronology

There should be 21.

Referenced: https://california.amateurtraveler.com/missions-of-california-map/#missions-of-california-map

https://californiamissionsfoundation.org/