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admin:features:geo:indexing [2011/01/10 23:35] els |
admin:features:geo:indexing [2016/06/28 22:38] (current) |
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| + | ~~NOTOC~~ | ||
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| {{page>:top_add&nofooter&noeditbtn}} | {{page>:top_add&nofooter&noeditbtn}} | ||
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| ===== Geographic Searches ===== | ===== Geographic Searches ===== | ||
| - | [[admin:features:geo:home|Overview]] -> [[admin:features:geo:latlong|Latitude and Longitude]] -> [[admin:features:geo:radius|Radius Distance Searches]] -> **[[admin:features:geo:indexing|Indexing]]** -> [[admin:features:geo:optimization|Optimization]] | + | [[admin:features:geo:home|Overview]] | [[admin:features:geo:latlong|Latitude and Longitude]] | [[admin:features:geo:radius|Radius Distance Searches]] | **[[admin:features:geo:indexing|Indexing]]** | [[admin:features:geo:optimization|Optimization]] |
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| * DOUBLE | * DOUBLE | ||
| * CHARACTER | * CHARACTER | ||
| - | * C STRING | + | * STRING |
| If geographic coordinates are stored in character-class datatypes, Omnidex will parse the latitude and longitude. Omnidex can accept the following notations: | If geographic coordinates are stored in character-class datatypes, Omnidex will parse the latitude and longitude. Omnidex can accept the following notations: | ||
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| <code> | <code> | ||
| create table "ZIPCODES" | create table "ZIPCODES" | ||
| - | physical "dat\zipcodes.dat" | + | physical "dat/zipcodes.dat" |
| ( | ( | ||
| - | "ZIP" C STRING(9) | + | "ZIP" STRING(9) |
| - | "CITY" C STRING(25) | + | "CITY" STRING(25) |
| "COUNTY_CODE" CHARACTER(3), | "COUNTY_CODE" CHARACTER(3), | ||
| "STATE" CHARACTER(2), | "STATE" CHARACTER(2), | ||
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| ==== Indexing Geographic Coordinates ==== | ==== Indexing Geographic Coordinates ==== | ||
| - | Geographic coordinates are indexed in a multi-column Omnidex index containing first the latitude and then the longitude. This index will then be available for use in optimizing the [[dev:sql:functions:distance|$DISTANCE function]] in SQL SELECT statements. | + | Geographic coordinates are indexed in a multi-column Omnidex index containing first the **longitude and then the latitude**. This index will then be available for use in optimizing the [[dev:sql:functions:distance|$DISTANCE function]] in SQL SELECT statements. |
| <code> | <code> | ||
| create table "ZIPCODES" | create table "ZIPCODES" | ||
| - | physical "dat\zipcodes.dat" | + | physical "dat/zipcodes.dat" |
| ( | ( | ||
| - | "ZIP" C STRING(9), | + | "ZIP" STRING(9), |
| - | "CITY" C STRING(25), | + | "CITY" STRING(25), |
| "COUNTY_CODE" CHARACTER(3), | "COUNTY_CODE" CHARACTER(3), | ||
| "STATE" CHARACTER(2), | "STATE" CHARACTER(2), | ||
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| "AREACODES" CHARACTER(15), | "AREACODES" CHARACTER(15), | ||
| "TIME_ZONE" TINYINT, | "TIME_ZONE" TINYINT, | ||
| - | omnidex "LATLONG" ("LATITUDE", "LONGITUDE"), | + | omnidex "LONGLAT" ("LONGITUDE", "LATITUDE"), |
| ) | ) | ||
| in "star.xml"; | in "star.xml"; | ||
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| * [[admin:optimization:home|Optimization Strategies]] | * [[admin:optimization:home|Optimization Strategies]] | ||
| - | * [[admin:optimization:geo:math|The Math Behind Geographic Searches]] | + | * [[admin:features:geo:math|The Math Behind Geographic Searches]] |
| * [[dev:sql:functions:distance|$DISTANCE function]] | * [[dev:sql:functions:distance|$DISTANCE function]] | ||