The CARTA system, developed by the Idan Computers team of Tel Aviv led by Joseph G. Freund, is the earliest known computerized contouring system based on random triangulation (TIN). Developed in 1971 on an IBM 1130 in Fortran IV, first publicly documented in February 1973, and already in international use by that date — it predates all other published TIN-based contouring implementations in the historical record.

Primary source: ASCE Surveying & Mapping Division Newsletter, Vol. 1973-9, February 1973 — original document held by Idan Computers.

Timeline

1971

CARTA developed at Idan Computers, Tel Aviv

The Idan Computers development team, led by Joseph G. Freund, developed the CARTA system on an IBM 1130 minicomputer, programmed in Fortran IV. The core innovation is a random triangulation algorithm for contour analysis — what is now called TIN (Triangulated Irregular Network) — guaranteeing that every contour line passes on the mathematically correct side of each surveyed point.

The system supports both metric and English-unit versions, runs on small computers, and is designed to be available to private and public clients alike.

Algorithm
Random triangulation
Hardware
IBM 1130
Language
Fortran IV
Point types
Up to 99 categories
Time saving
~90% vs manual
Output
Contour map + sections
1973

CARTA announced in ASCE newsletter — already in international use

The American Society of Civil Engineers' Surveying & Mapping Division published a reprint feature on CARTA. By this date the system had already been adopted by major engineering firms in the United States, Italy, and the Far East — international deployment preceded the public announcement.

The article also documents CARTA's presentation at the 8th Data Processing Conference of the Information Processing Association of Israel in Tel Aviv.

ASCE Newsletter, February 1973 — original document held by Idan Computers
1973

Commercial deployment via Engineering Services International

Carta/Terra Ltd., a sub-division of Engineering Services International Ltd. of Tel Aviv — Israel's largest civil engineering firm — introduced the system to the Israeli market, confirming immediate commercial adoption alongside the international rollout.

ASCE Newsletter, February 1973
1981

Intergraph Corporation formally evaluates CARTA

Keith H. Schonrock, Vice President of Graphics Systems at Intergraph Corporation (Huntsville, Alabama) — then the world's leading GIS and mapping workstation company — wrote to Idan Computers following a formal evaluation. Intergraph expressed interest in licensing CARTA as a third-party software package bundled with Intergraph system sales.

An unsolicited licensing approach from the dominant mapping software vendor of the era constitutes strong independent corroboration of CARTA's technical distinctiveness, a full decade after its development.

Intergraph letter, December 23, 1981 — original document held by Idan Computers
Today

Idan Computers continues active development

The spatial computation work that began with CARTA in 1971 has continued without interruption for over five decades. Idan Computers Engineering Ltd. remains an active software company, with current products including solar panel planning, 3D visualization, and GIS tools developed and maintained by the Idan Computers team, led by Joseph G. Freund.

www.idan.com →

For Researchers: Idan Computers holds original physical copies of the ASCE newsletter reprint (February 1973) and the Intergraph evaluation letter (December 23, 1981). These documents are available for inspection and citation. Contact: info@idan.com
Note on priority: The academic literature on TIN-based contouring frequently cites work from the mid-to-late 1970s as foundational. The CARTA system predates this body of work by several years. The ASCE newsletter constitutes a contemporaneous published record of international deployment as of February 1973, with development completed in 1971. Researchers with documentation of earlier systems are invited to contact Idan Computers.