# 投影转换器 — 专业地形学辅助工具

> Professional coordinate transformation tool for GIS, surveying, and engineering. (iPhone/iPad app by Zhikang Qin.)

- Source: https://appshunter.io/ios/app/id1123601167 (this page in markdown: same URL + `.md`)
- Developer: [Zhikang Qin](https://appshunter.io/developer/1123601166)
- Category: Utilities, Productivity
- Price: $0.99
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: Chinese (Simplified, China), American English
- Released: 2016-06-16
- Data updated: 2026-07-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/id1123601167/reviews.md

## What is 投影转换器?

投影转换器是专为地理信息科学（GIS）、测绘、工程及相关领域的专业人士与学生打造的一款终极坐标转换工具。无论您需要处理的是大地坐标还是投影坐标，它都能提供无与伦比的精度与易用性。

主要功能
  * 专业级转换引擎: 基于业界广泛使用的 PROJ 库，确保每一次转换都精准可靠。支持正算、反算与完整的坐标转换流程，满足最严苛的专业要求。
  * 海量坐标系库: 内置源于 EPSG 等权威机构的数千种坐标参考系统（CRS），覆盖全球。强大的搜索功能助您在海量数据中快速定位所需。
  * 强大的自定义投影: 不满足于内置库？您可以轻松创建、编辑和管理自己的投影参数。编辑器提供实时语法校验和 ID 冲突检测，让复杂的配置过程万无一失。
  * 可视化投影预览: 在选择或创建投影时，可即时生成该坐标系下的世界地图预览图。直观感受投影的形变、适用范围与外观，告别盲选。
  * 灵活的格式支持: 支持地理坐标在角度（度分秒）与弧度间的自由切换，并可在地图上直观拾取坐标，满足不同场景下的数据输入与展示要求。
  * 简洁高效的体验: “最近使用”列表会自动记录您的常用投影，方便快速调用。整体界面设计简洁，专注于核心功能，让您免于不必要的干扰。

投影转换器是外业工程师、GIS 分析师、地理学学生以及任何需要处理空间数据的用户的理想选择。
立即下载，让复杂的坐标转换变得前所未有的简单、高效。

## Key features

- Professional-grade conversion engine
- Extensive library of coordinate systems
- Customizable projection creation
- Visual projection previews
- Flexible format support
- Intuitive user interface

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/id1123601167/reviews.md

### 1/5 — 没任何客服联系方式

*2016-11-10*

经纬度定完转80坐标系，跟手持完全搭不上边

### 4/5 — 坐标

*2016-06-19*

怎么没有指导用

## Frequently asked questions about 投影转换器

### What is 投影转换器 used for?

投影转换器 is a professional tool designed for precise coordinate transformations, essential for Geographic Information Science (GIS), surveying, and engineering tasks. It handles both geographic and projected coordinates with high accuracy.

### How accurate is 投影转换器?

The app utilizes the industry-standard PROJ library, ensuring every conversion is accurate and reliable. It supports forward, inverse, and complete coordinate transformation processes to meet stringent professional requirements.

### Does 投影转换器 support many coordinate systems?

Yes, 投影转换器 includes thousands of coordinate reference systems (CRS) from authoritative sources like EPSG, covering global data. A powerful search function helps you quickly find the specific CRS you need.

### Can I create my own coordinate systems in 投影转换器?

Absolutely. The app allows you to easily create, edit, and manage your own projection parameters. It features real-time syntax checking and ID conflict detection for a seamless customization experience.

### Is 投影转换器 suitable for beginners?

While designed for professionals, 投影转换器 offers a concise and efficient experience. The visual projection preview feature helps users intuitively understand projections, making it more accessible.

### What devices does 投影转换器 support?

投影转换器 is available for iPhone and iPad, providing a consistent experience across Apple's mobile platforms.

### How often is 投影转换器 updated?

The app was last updated on October 7, 2025, indicating ongoing development and support. The latest version is 3.0.

### Does 投影转换器 have ads?

No, 投影转换器 is ad-free, providing an uninterrupted user experience for its paid users.

## Version history (last 5 releases)

### 3.0 — 2025-10-07

This is a milestone update. PJ Converter has been rebuilt from the ground up using the latest SwiftUI technology, delivering a faster, more powerful, and more modern professional tool.

Here's what's new in this major update:
  * [A FRESH NEW LOOK] Completely Redesigned UI
      * The app has been rewritten entirely. It's faster, more responsive, and features a modern design with fluid animations.
      * Native Dark Mode: Perfectly integrated with iOS Dark Mode for a more comfortable viewing experience in low-light conditions.
  * [MAJOR FEATURE LEAP] More Powerful Conversions
      * Degree/Radian Switching: Seamlessly switch geographic coordinates between degrees (DMS) and radians to meet diverse data requirements.
      * Upgraded Map Picker: The map picker can now directly return values in degrees for a more intuitive workflow.
  * [SMARTER MANAGEMENT] A More Professional Projection Library
      * Real-Time Validation: The custom projection editor now validates your parameters in real-time and warns of potential ID conflicts, making configuration safer.
      * Recents: Your most frequently used coordinate systems now automatically appear at the top of the list for quick access.
  * [REWRITTEN CORE] A More Stable Foundation
    We've overhauled the data layer for faster and more reliable access to your custom and recent projections. We've also introduced new observability tools, which will help us find and fix 
issues even faster in the future.

We believe this upgrade will lead to a more efficient and enjoyable workflow. We hope you enjoy it.

### 2.3 — 2021-02-15

Adapt to iOS 14 and fix some bugs.

### 2.2 — 2017-10-07

适配了iOS 11和iPhone X。

### 2.1 — 2017-02-15

添加了投影预览功能，你可以预览任意投影下的世界地图轮廓。
你可以去投影参数查询页面点击“预览”来体验！

### 2.0 — 2017-01-10

重新设计了全部UI，逻辑更加清晰，界面更加优雅，操作更加流畅，增强了稳定性。

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## More apps by Zhikang Qin

- [CycleTask — Rituals on Repeat](https://appshunter.io/ios/app/cycletask-rituals-on-repeat/id6752910735)

All apps by Zhikang Qin: https://appshunter.io/developer/1123601166

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-27.*