Geocoding, which is more or less the conversion of an address or a description of a location into a map or GPS coordinates, in most cases is easy to perform. However, performing a conversion of multiple addresses (batch geocoding) that runs into hundreds or thousands might be a little tricky as far as ensuring the integrity of your data is concerned. It is also time-consuming and quite prone to error, which is a no-brainer should you ply the manual route.
Showmymap simplifies the process for you and makes it easy to perform a batch geocoding without breaking a sweat in just a few easy steps. Showmymap uses the Google Maps geocoding API, which has one of the highest quality data available you can lay your hands on.
At Showmymap, we make it easy to create maps from your data that you can share privately, or make publicly for all to see and use. You can also embed the map generated for you easily on your website without any difficulty.
Types of Geocoding and The Way They Works
When it comes to mapping addresses into GPS coordinates, they are various ways you can use to achieve your aim, all having various degrees of accuracy.
Interpolation Geocoding and Parcel Geocoding are two popular ways geocoders use in geocoding.
What is Interpolation Geocoding?
This method of geocoding involve interpolating a location geocoordinates using math to approximate a position. To explain this method better, let’s make use of an illustration.
For example, let’s say you wanted to convert 160 Main street address in your hometown to geographic coordinates.
Using the interpolation geocoding method, the first step involves matching the street name – 160 Main Street; direction, and street type against a block range in the street centerline database. It would be differentiated from other Main Streets by using the city name or postal code, if available.
Once this step has been successfully concluded, the geocoder having determined the street of interest will attempt to use the street number to find the closest block (from 100 – 200 blocks of Main Street).
Next comes the interpolation. This phase is one of the least accurate parts when it comes to the geocoding process.
The geocoder guesses the position of 160 Main Street to be a little more than halfway down the block (from block 150) based on logic.
The geocoder also has to guess how far off from the street the block is located based on the data available from the center line of the database.
Interpolation has several stages where a geocoder has to take a guess and estimate distances which might be right on the money or totally off.
For this reason, it is recommended you consider other precise types of geocoding if accuracy is of great importance to you.
What is Parcel Geocoding?
Parcel geocoding utilizes property boundaries or centroids that have been assigned to specific addresses. Geocoding using a parcel‐based approach involves looking for a match between a parcel address and the address searched for.
In most cases, Parcel geocoding will produce a higher spatial accuracy than linear interpolation due to its strict matching criteria – requires a one‐to‐one match.
While interpolation can basically help you to locate an area or vicinity, it rarely helps pinpoint an exact area. Parcel geocoding, on the other hand, goes a step further and has the potential to help you locate an exact property, providing you with a more geometrically accurate geocoded location.
Rather than interpolating a point based on nearby known points, parcel geocoding requires knowing the boundaries of each parcel.
Following our illustration of 160 Main Street, the geocoder would look up that specific address in the parcel database. It would still need to be differentiated from other Main Street in the database with the aid of a postal code or city, the only difference this time is that interpolation, which is based on block-level data is not required as the geocoding uses a parcel-level data.
How Does Showmymap Geocoding Work?
Our geocoding uses only the best available geocoding data available at Showmymap which is the same one utilized by Google Maps. Google employs parcel geocoding for their Maps Geocoding API to get an accurate, precise result.
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