Alternative Text Description for Pre & Post 1970

TABLE OF CONTENTS

MAP OVERVIEW

This map displays the distribution of parcels in Florida categorized by whether structures were built before 1970 or during/after 1970. The map uses a simple temporal classification to show the age distribution of buildings across the state, providing insight into development patterns and the location of older versus newer construction. The visualization covers the entire State of Florida and portions of neighboring states for geographic context.

GEOGRAPHIC CONTEXT

The map shows the State of Florida in its entirety, extending from the panhandle region in the northwest to the Florida Keys in the south. Major cities labeled include Jacksonville in the northeast, Tallahassee in the panhandle, Orlando in central Florida, Tampa on the west-central coast, Cape Coral on the southwest coast, and Miami in the southeast. The Gulf of America borders Florida to the west and northwest, while the Atlantic Ocean lies to the east. Portions of neighboring states including Alabama, Georgia, and Dothan are visible to the north for geographic reference.

KEY INSIGHTS

Pre-1970 structures appear as scattered yellow features concentrated primarily in urban centers and along both coasts. Notable concentrations of pre-1970 buildings are visible around Miami, Orlando, Tampa, and Jacksonville, suggesting these areas had substantial development before 1970. Post-1970 structures, shown in green, are far more numerous and widespread across the entire state, indicating significant growth and development after 1970. The density of post-1970 development is particularly evident in southeastern Florida around Miami, in the Orlando metropolitan area, along the Tampa Bay region, and in southwestern Florida near Cape Coral and Fort Myers. The extensive green coverage throughout the state demonstrates that the majority of Florida's current building stock was constructed after 1970, reflecting the state's rapid population growth and urban expansion in recent decades.

VISUAL ELEMENTS

Pre & Post 1970 Layer

This layer represents parcel-level data showing building construction dates divided into two temporal categories: structures built before 1970 and those built during or after 1970.

Pre 1970 Structures

Appearance:

Bright yellow polygons of varying sizes scattered across the state.

Distribution:

Pre-1970 structures appear throughout Florida but are notably concentrated in established urban cores and historic city centers. Visible clusters occur in Miami and southeastern Florida, around Orlando, in the Tampa Bay area, near Jacksonville, and in Tallahassee.

Notable locations:

The Miami metropolitan area shows considerable yellow features, particularly in the older urban core. Central Florida around Orlando displays scattered pre-1970 development. The Tampa-St. Petersburg area contains multiple yellow clusters along the coast. Smaller concentrations appear in historic downtown districts of medium-sized cities throughout the state.

Spatial patterns:

Pre-1970 structures tend to cluster in traditional downtown areas and along major transportation corridors. Coastal areas show more pre-1970 development than inland rural regions, reflecting Florida's historic settlement patterns along navigable waters and beaches.

Post 1970 Structures

Appearance:

Bright green polygons densely distributed across most of the state, creating extensive coverage particularly in urban and suburban areas.

Distribution:

Post-1970 structures dominate the map, appearing throughout virtually all populated areas of Florida. The highest densities occur in the southeastern coastal region extending from Miami northward, the greater Orlando metropolitan area, the Tampa Bay region, and southwestern Florida near Cape Coral and Fort Myers.

Notable locations:

Southeastern Florida from Miami to West Palm Beach shows extremely dense post-1970 development. The Interstate 4 corridor connecting Tampa and Orlando displays continuous development. Cape Coral and the Fort Myers area in southwestern Florida show extensive green coverage indicating substantial post-1970 growth. The Jacksonville metropolitan area shows significant post-1970 expansion. Even the Florida Keys display scattered green features indicating modern development.

Spatial patterns:

Post-1970 structures form extensive suburban sprawl patterns radiating outward from major urban centers. Development follows major highway corridors and extends inland from coastal areas. The pattern suggests outward metropolitan expansion, with newer construction filling in previously undeveloped areas between cities and extending development further into formerly rural regions.

Overlapping Patterns

Areas around major cities often show yellow pre-1970 structures surrounded by or interspersed with extensive green post-1970 development, illustrating urban cores with historic buildings enveloped by suburban expansion. This pattern is particularly evident in Miami, Orlando, Tampa, and Jacksonville.

SYMBOL GUIDE

ADDITIONAL INFORMATION

This map illustrates temporal patterns of development across Florida by showing where older versus newer buildings are located. The dominance of post-1970 construction (green) reflects Florida's dramatic population growth and development boom in the latter half of the 20th century and into the 21st century. The scattered pre-1970 structures (yellow) represent Florida's historic urban cores and earlier settlement patterns. The gray background represents either undeveloped parcels, parcels without building structures, or areas where year-built data is unavailable. This visualization is useful for understanding development history, identifying historic districts, assessing infrastructure age, and planning preservation or redevelopment efforts. The decade-based classification system used in this dataset allows for temporal analysis of building stock, though this particular map uses a simplified binary classification of pre-1970 versus post-1970.

DATA CONTEXT

Data Source:

The data represents parcels dissolved and categorized by the decade of the actual year built for each parcel polygon within the State of Florida. The actual year built represents the original construction year of the structure or building on each property, distinct from effective year built which would represent renovation or update dates. Data source layer name: YB_DECADES_2024.

Definition Query:

No definition query or filter criteria was applied to this dataset.

Scale Information:

The map shows a statewide view of Florida at a scale appropriate for viewing broad regional patterns. At this zoom level, individual parcels are visible as small dots or polygons, making the map suitable for understanding general distribution patterns rather than identifying specific properties.

Coordinate System:

NAD_1983_HARN_Florida_GDL_Albers (WKID 3087)

Time Period of Content:

The dataset is dated 2024, indicating the parcel data and year-built information reflects records current as of 2024. The temporal classification represents construction dates spanning from before 1970 to present.

Limitations:

Parcels shown in gray have no year-built values, which may indicate undeveloped land, missing data, or structures for which construction dates are unknown. The accuracy of year-built data depends on county property appraiser records, which may contain errors or gaps. The binary classification of pre-1970 versus post-1970 simplifies what may be more nuanced decade-by-decade development patterns available in the underlying dataset.

Map Coverage:

The map covers the entire State of Florida from the western panhandle to the Florida Keys, and includes portions of neighboring Alabama, Georgia, and the Gulf of America and Atlantic Ocean waters for geographic context.

The alternative text description of this map was AI-generated and may contain inaccuracies.