Reconstructing History through GIS: Land Grants and Indigenous Agriculture in New Spa

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The Viceroyalty of New Spain was Spain's colonial government over all its Central American land claims. It was essentially composed of the land of today's Mexico. Despite the limited documentation available from this time, the Viceroyalty's official land grants and their differences over time can give insight into what was happening in terms of relations between Spanish ranchers and Native American farmers. A study by Richard Hunter of State University of New York used three-dimensional GIS to map the ranchers' land grants over time, using data of the elevation, slope, and slope direction to show patterns in the types of land granted by the government in various years.
<ul>Between 1535 and 1544 (white squares) grants for ranches were on gentle slopes, low elevation slopes that faced south. Low elevation and southern-facing slope are good factors for agriculture, but also good factors for bountiful pasture, so the land-grantees were getting prime land at this time.
Between 1559 and 1568 (blue squares) the grants were on the highest average elevations with the steepest slopes. This, explains Hunter was because of policy change by the Viceroyalty: they were now attempting to protect the indigenous peoples' crops from cattle. Ranches were required to be certain distance away from indigenous pueblos and their corresponding agricultural zones. Indigenous nobility were also awarded land during this time.
Between 1577 and 1586 (orange squares) ranches were granted on slopes that held evidence of terrace farming. Hunter explains that this is because the native populations had been hit intensely by disease and were shrinking, abandoning their outlying and least productive terrace farms.
<span style="font-size: x-small;">Between 1589 and 1596 (red squares) the government continued to grant land that was formerly used for agricultural terraces. Hunter explains that this is the result of a policy called <i>congregaci

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