CoordTool

使用说明视频

Video Introduction

Video content coming soon

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Q & A

What is the UTM coordinate system?

UTM (Universal Transverse Mercator) divides the Earth into 60 zones, each 6° wide. It converts geographic coordinates (latitude/longitude) into a flat Cartesian plane (Easting/Northing in meters), making it ideal for engineering, surveying, and CAD applications.

What is the relationship between WGS84 and UTM?

WGS84 (World Geodetic System 1984) is the global coordinate reference used by GPS, Google Earth, and RTK devices — it expresses positions as latitude and longitude. UTM is a projection method that converts WGS84 lat/lon into metric planar coordinates (X/Y in meters). In short: WGS84 defines "where on Earth," UTM converts it into "X and Y on a drawing."

What is a DXF file?

DXF (Drawing Exchange Format) is AutoCAD's standard interchange format, used to share graphic data — such as parcel boundaries, roads, tower locations, and contours — between CAD, surveying, and GIS software.

What is the difference between DXF and KML?

DXF is used for CAD engineering work, using UTM coordinates in meters for precise drafting and construction layout. KML is used for Google Earth, mapping apps, and GPS/RTK devices, using geographic coordinates (lat/lon) for map visualization and sharing. This tool converts between both worlds.

How do I export a DXF file from CAD?

Before exporting, confirm that your drawing is georeferenced with real UTM coordinates (in meters) — otherwise the converted KML will not position correctly in Google Earth. Use the WBLOCK command to export only the target polygons and avoid exporting the full drawing with complex layers. Export path: File → Save As → File Type: DXF. Recommended versions: AutoCAD 2007 or AutoCAD 2010 DXF.

How accurate is the coordinate conversion?

The mathematical conversion is highly accurate — typically achieving centimeter to millimeter precision. Real-world accuracy depends on your source data: standard GPS/GNSS gives ±3–10 m; DGPS and SBAS differential correction improves to sub-meter; RTK GPS using a base station or CORS network achieves centimeter-level accuracy.

What file formats are supported?

Input: DXF (AutoCAD), KML (Google Earth / GPS/RTK devices), or plain text (manual entry). Output: Excel (.xlsx), KML, and DXF — covering the full CAD ↔ GIS workflow.

Is my data processed on a server?

No. All coordinate conversion and file parsing runs entirely in your browser. Your DXF, KML, and coordinate data never leave your device, making it safe for sensitive survey data such as parcel boundaries, route paths, and tower coordinates.

How do I batch-convert standalone control points?

DXF upload only recognises polygons and polylines (POINT entities are skipped). For batch control points / pile points / equipment points, use Manual Coordinate Input: paste or upload all your E,N coordinates (one per line, or via Excel), convert, then download KML. Each point is stored as an independent <Point> Placemark inside the "顶点" subfolder, so Google Earth shows every point as a clickable marker.

I don't know my UTM Zone — how do I find out?

Click the 📍 Not sure? badge next to the Zone selector — a help dialog opens with: (1) a quick country/region lookup table, (2) the world UTM zones map, (3) a calculation formula Zone = floor((lon+180)/6)+1, and (4) rescue tactics (ask the surveyor, check the DXF filename, or drop any coordinate into Google Earth). Wrong Zone offsets your output by hundreds of km, so verify before converting.

Surveying Tool

UTM → Lat/Lon Batch Convert

AutoCAD DXF → Vertices → WGS84 Lat/Lon → KML + Excel one-click export

🎁 试用样本

UTM → Lat/Lon

DXF / Text input

⇆

Lat/Lon → UTM

KML file upload

01

Parameters

Zone · Hemisphere · Ellipsoid

02

Input Coords

Upload DXF or type manually

03

Convert

UTM → WGS84 Lat/Lon

04

Download

Excel + KML files

01 Projection Parameters

Zone 📍 不知道选哪个？

Hemisphere

Ellipsoid

Zone & Hemisphere auto-detected from KML — override in the zone card below

02 Select Input Method

Upload DXF File

Export .dxf from AutoCAD
Auto-detects closed polygon vertices

Manual Coordinate Input

One coordinate per line
Format: Easting, Northing

Click to select a .dxf file, or drag & drop

Supports R12 / R2000 / R2018 · LWPOLYLINE / POLYLINE

Parsing DXF file …

Processing large file, please wait

DXF Preview — Select polygons, then confirm

Paste text or upload an Excel file

Excel auto-detects coordinate columns — works with or without headers
Coordinates can be in one cell ("E,N") or two separate columns
Drag & drop a .xlsx/.xls/.csv file anywhere in this panel

Format: Easting, Northing · one per line · comma or space

03 Batch Convert

04 Results & Downloads

Conversion Results

Total 0

OK 0

Failed 0

📏

Trusted by Surveyors Worldwide

From RTK field surveys to drone mapping — here's what professionals say

如何选择 UTM Zone & 半球？

⚠ Zone 或半球选错，转换出的坐标会在地图上偏离几百公里。请务必确认！

📋 方法 1：按国家 / 地区快速查（最常用）

地区	Zone	半球
中国（华北：北京、天津）	50	N
中国（华东：上海、青岛、南京）	50, 51	N
中国（华南：广州、深圳、海南）	49, 50	N
中国（西南：四川、云南、贵州）	47, 48	N
中国（西北：新疆、西藏、青海）	43, 44, 45, 46	N
美国本土	10–19	N
加拿大	7–22	N
墨西哥	11–16	N
巴西	18–25	S
阿根廷 / 智利	18–21	S
秘鲁 / 厄瓜多尔 / 哥伦比亚	17–19	S/N
西班牙 / 葡萄牙	29, 30	N
法国 / 德国 / 意大利	30–33	N
英国	30	N
澳大利亚	49–56	S
日本	51–56	N

💡 跨多个 Zone 的项目：按地块主体所在 Zone 选；少量越界点会有 1-3 米偏差，远小于 RTK 精度，无影响。

🗺 方法 2：看世界 UTM 分带图

水平 1–60 = 经度分带（每带 6°）；垂直字母 C–X = 纬度分带（每带 8°）。N 字母及以后属于北半球，M 字母及以前属于南半球。

UTM zones world map

📐 方法 3：从经度计算（最精确）

Zone = floor((经度 + 180) / 6) + 1 半球：纬度 ≥ 0 → N（北），< 0 → S（南）

示例：
北京 (116°E, 40°N) → floor((116+180)/6)+1 = Zone 50, N
纽约 (-74°W, 40°N) → floor((-74+180)/6)+1 = Zone 18, N
利马 (-77°W, -12°S) → floor((-77+180)/6)+1 = Zone 18, S
悉尼 (151°E, -33°S) → floor((151+180)/6)+1 = Zone 56, S

🔍 还是找不到？三种应急方法

问做这份 DXF 的测绘师 / CAD 工程师，他们做图时一定知道
看 DXF 文件名 / 图层注释，很多带 zone 信息（如 WGS84_UTM_50N_xxx.dxf）
打开 Google Earth，把任意一个坐标点拖进去，状态栏会显示当前 zone