Kakao Map vs Google Maps Coordinates โ€” Why the Same Location Shows Different Lat/Lng

Why the same building shows slightly different coordinates on Kakao Map vs Google Maps โ€” WGS84 standard, internal coordinate handling, real examples, and what to watch for.

May 10, 2026#Kakao Map#Google Maps#coordinates#WGS84#KATEC#latitude longitude#guide

๐Ÿ—บ The same building tapped on Kakao Map and Google Maps returns coordinates that differ by 4โ€“5 decimal places. This is a common surprise when working with both services in Korea. Quick answer: both use WGS84, but their internal coordinate handling, POI reference databases, and Korean cadastral corrections differ โ€” producing 10โ€“70 m differences in lat/lng. This post explains exactly why, with real Seoul examples and what to watch for when integrating coordinate data.

Kakao Map vs Google Maps coordinate comparison illustration

๐ŸŒ Both Use WGS84 โ€” At the Surface, Identical

First, the basics: both Kakao Map and Google Maps expose coordinates in WGS84 (EPSG:4326) to users.

AspectKakao MapGoogle Maps
User-facing coordinatesWGS84WGS84
Internal coordinate systemsWGS84 + KATEC/TM (Korean surveying)WGS84 + Web Mercator (tiles)
Map tile projectionWeb Mercator (EPSG:3857)Web Mercator (EPSG:3857)
Coordinate precision6โ€“7 decimals7 decimals

โ†’ The standards are the same; the misconception "they use different coordinate systems" is false. The micro-differences come from internal conversion stages and reference data.

๐Ÿ‡ฐ๐Ÿ‡ท Kakao Map's Internal Processing

Kakao Map's SDK is optimized for Korean users โ€” surveying, cadastral, address, and POI data are tightly integrated with Korean national reference systems: TM Central Origin (EPSG:5186) and KATEC.

Coordinate Flow

  1. User taps map โ†’ Web Mercator pixel coordinate
  2. Web Mercator โ†’ WGS84 lat/lng (direct conversion)
  3. (As needed) WGS84 โ†’ TM/KATEC for Korean cadastral matching
  4. Return WGS84 to user

Where Micro-errors Creep In

  • Floating-point accumulation in the Web Mercator โ†’ WGS84 conversion (sub-meter)
  • POI matching uses Kakao's own database (Korean cadastral-based)
  • Some POIs (airports, public facilities) have intentional micro-corrections

๐Ÿ‡บ๐Ÿ‡ธ Google Maps' Internal Processing

Coordinate Flow

  1. Tap โ†’ Web Mercator pixel
  2. Web Mercator โ†’ WGS84 lat/lng
  3. POI matching against Google Places (global reference DB)
  4. WGS84 to user

Differences

  • Global reference dataset (Google Street View, sat imagery, NGA WGS-84 spec)
  • Korean cadastral data partially reflected
  • POIs in Korea use Google's own ground truth, not Korean cadastral

๐Ÿ“ Real Differences in Seoul

Same building, different coordinates (typical 4โ€“5 decimal place divergence):

LocationKakao (example)Google (example)ฮ”
Seoul City Hall37.566535, 126.97796937.566350, 126.977868~20 m
Gwanghwamun37.575945, 126.97688437.575769, 126.976895~20 m
Gangnam Station Exit 1137.498095, 127.02761037.497952, 127.027619~16 m
Incheon Airport T137.449383, 126.45085637.448825, 126.451192~70 m

Note: Above are illustrative examples; both services update over time. For exact comparison, query both services at the same moment.

โ†’ Differences ~10โ€“70 m. Negligible for general navigation; meaningful for surveying and precise GIS.

๐Ÿงฎ Where the Differences Come From

CauseImpact
POI reference DB differs (Kakao cadastral vs Google global)Large (10โ€“70 m)
Floating-point conversion accumulationSmall (<1 m)
Click-pixel rounding differencesSmall (<5 m)
Tile zoom-level correctionsVery small
Korean cadastral correction (Kakao only)Medium (5โ€“30 m)

๐Ÿ›  What to Watch When Mixing Coordinates

1. Mixing data from both services

  • Tag every coordinate with its source
  • Normalize to one standard (typically WGS84/EPSG:4326)
  • Preserve precision at 6 decimals (see WGS84 guide)

2. KATEC โ†” WGS84 conversion

  • Some legacy Korean GIS uses KATEC
  • Use proj4js (JavaScript) or proj4 (Python/R)
  • KATEC โ‰ˆ EPSG:5181 (variants exist)

3. Don't pass Kakao coords to Google APIs verbatim

  • Even at the same location, the two services may have slightly different POI anchor points
  • Result: small mismatch (~10โ€“30 m), tolerable for general use, problematic for precise overlays

Practical tip: Building "center" vs "entrance" โ€” Kakao often anchors to building centroid, Google sometimes to the main entrance. Treat differences โ‰ค30m as expected.

๐ŸŽฏ When to Use Which Service

Use caseRecommended
Korean real estate / cadastralKakao Map (precise lot/road-name matching)
Global travel / aviation / shippingGoogle Maps (worldwide consistency)
Korean POI / restaurantsKakao Map (rich Korean POI DB)
International business location sharingGoogle Maps (same coordinates work globally)
Quick lat/lng lookup or convertFindLatLng โ€” supports both
Korea-only product developmentKakao SDK
Global productGoogle Maps Platform

๐Ÿ’ฌ FAQ

Q. Are GPS coordinates from a smartphone identical to Kakao or Google's? Phone GPS is raw WGS84 โ€” no conversion stage. So GPS โ‰  Kakao โ‰  Google coordinates can all differ slightly (~10 m). All point to the same place; the variation is in reference DB anchor.

Q. Which is "more accurate"? Depends on what you mean. For Korean cadastral matching โ†’ Kakao. For global GPS reference โ†’ Google. For typical users, both are fine.

Q. If I take Kakao coords and pass them to Google APIs, will the location be wrong? Slightly off (~10โ€“30 m), tolerable for distance/display use cases. For precise overlays, normalize to one service's coords or use FindLatLng to convert from a single source.

Q. When are KATEC/TM coordinates used? Mostly in older Korean government GIS systems and surveying tools. For most web/app development, WGS84 is enough. Use proj4 if conversion is needed.

Q. What if the difference is more than 1 km? Almost always indicates mismatched coordinate systems (e.g., KATEC value being interpreted as WGS84) or a data transformation bug. Verify input source and CRS.

๐Ÿ“ Wrap-Up

  • Both Kakao Map and Google Maps expose WGS84 โ€” standards are the same
  • POI reference DB + Korean cadastral correction create 10โ€“70 m differences for the same location
  • Negligible for general use, meaningful for precise GIS
  • Kakao for Korean cadastral/POI; Google for global consistency
  • When mixing data, tag the source and normalize

Convert and compare Kakao/Google coordinates in one place! FindLatLng โ€” Lat/Lng Finder โ†’

๐Ÿ“š References & Further Reading